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Bahram Sangani N, Koetsier J, Mélius J, Kutmon M, Ehrhart F, Evelo CT, Curfs LMG, Reutelingsperger CP, Eijssen LMT. A novel insight into neurological disorders through HDAC6 protein-protein interactions. Sci Rep 2024; 14:14666. [PMID: 38918466 PMCID: PMC11199618 DOI: 10.1038/s41598-024-65094-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2024] [Accepted: 06/17/2024] [Indexed: 06/27/2024] Open
Abstract
Due to its involvement in physiological and pathological processes, histone deacetylase 6 (HDAC6) is considered a promising pharmaceutical target for several neurological manifestations. However, the exact regulatory role of HDAC6 in the central nervous system (CNS) is still not fully understood. Hence, using a semi-automated literature screening technique, we systematically collected HDAC6-protein interactions that are experimentally validated and reported in the CNS. The resulting HDAC6 network encompassed 115 HDAC6-protein interactions divided over five subnetworks: (de)acetylation, phosphorylation, protein complexes, regulatory, and aggresome-autophagy subnetworks. In addition, 132 indirect interactions identified through HDAC6 inhibition were collected and categorized. Finally, to display the application of our HDAC6 network, we mapped transcriptomics data of Alzheimer's disease, Parkinson's disease, and Amyotrophic Lateral Sclerosis on the network and highlighted that in the case of Alzheimer's disease, alterations predominantly affect the HDAC6 phosphorylation subnetwork, whereas differential expression within the deacetylation subnetwork is observed across all three neurological disorders. In conclusion, the HDAC6 network created in the present study is a novel and valuable resource for the understanding of the HDAC6 regulatory mechanisms, thereby providing a framework for the integration and interpretation of omics data from neurological disorders and pharmacodynamic assessments.
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Affiliation(s)
- Nasim Bahram Sangani
- Department of Biochemistry, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University, 6200 MD, Maastricht, The Netherlands.
- GKC, Maastricht University Medical Centre, 6229 ER, Maastricht, The Netherlands.
| | - Jarno Koetsier
- Department of Biochemistry, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University, 6200 MD, Maastricht, The Netherlands
- GKC, Maastricht University Medical Centre, 6229 ER, Maastricht, The Netherlands
| | - Jonathan Mélius
- DataHub, Maastricht University & Maastricht UMC+, P. Debyelaan 15, 6229 HX, Maastricht, The Netherlands
| | - Martina Kutmon
- Maastricht Centre for Systems Biology (MaCSBio), Maastricht University, 6200 MD, Maastricht, The Netherlands
| | - Friederike Ehrhart
- Department of Bioinformatics - BiGCaT, Research Institute of Nutrition and Translational Research in Metabolism (NUTRIM), Maastricht University, 6200 MD, Maastricht, The Netherlands
- Department of Psychiatry and Neuropsychology, Research Institute for Mental Health and Neuroscience (MHeNs), Maastricht University, 6200 MD, Maastricht, The Netherlands
| | - Chris T Evelo
- Maastricht Centre for Systems Biology (MaCSBio), Maastricht University, 6200 MD, Maastricht, The Netherlands
- Department of Bioinformatics - BiGCaT, Research Institute of Nutrition and Translational Research in Metabolism (NUTRIM), Maastricht University, 6200 MD, Maastricht, The Netherlands
| | - Leopold M G Curfs
- GKC, Maastricht University Medical Centre, 6229 ER, Maastricht, The Netherlands
| | - Chris P Reutelingsperger
- Department of Biochemistry, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University, 6200 MD, Maastricht, The Netherlands
- GKC, Maastricht University Medical Centre, 6229 ER, Maastricht, The Netherlands
| | - Lars M T Eijssen
- Department of Bioinformatics - BiGCaT, Research Institute of Nutrition and Translational Research in Metabolism (NUTRIM), Maastricht University, 6200 MD, Maastricht, The Netherlands
- Department of Psychiatry and Neuropsychology, Research Institute for Mental Health and Neuroscience (MHeNs), Maastricht University, 6200 MD, Maastricht, The Netherlands
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Jiang N, Li W, Jiang S, Xie M, Liu R. Acetylation in pathogenesis: Revealing emerging mechanisms and therapeutic prospects. Biomed Pharmacother 2023; 167:115519. [PMID: 37729729 DOI: 10.1016/j.biopha.2023.115519] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Revised: 09/08/2023] [Accepted: 09/14/2023] [Indexed: 09/22/2023] Open
Abstract
Protein acetylation modifications play a central and pivotal role in a myriad of biological processes, spanning cellular metabolism, proliferation, differentiation, apoptosis, and beyond, by effectively reshaping protein structure and function. The metabolic state of cells is intricately connected to epigenetic modifications, which in turn influence chromatin status and gene expression patterns. Notably, pathological alterations in protein acetylation modifications are frequently observed in diseases such as metabolic syndrome, cardiovascular disorders, and cancer. Such abnormalities can result in altered protein properties and loss of function, which are closely associated with developing and progressing related diseases. In recent years, the advancement of precision medicine has highlighted the potential value of protein acetylation in disease diagnosis, treatment, and prevention. This review includes provocative and thought-provoking papers outlining recent breakthroughs in acetylation modifications as they relate to cardiovascular disease, mitochondrial metabolic regulation, liver health, neurological health, obesity, diabetes, and cancer. Additionally, it covers the molecular mechanisms and research challenges in understanding the role of acetylation in disease regulation. By summarizing novel targets and prognostic markers for the treatment of related diseases, we aim to contribute to the field. Furthermore, we discuss current hot topics in acetylation research related to health regulation, including N4-acetylcytidine and liquid-liquid phase separation. The primary objective of this review is to provide insights into the functional diversity and underlying mechanisms by which acetylation regulates proteins in disease contexts.
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Affiliation(s)
- Nan Jiang
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Nanjing 210009, China
| | - Wenyong Li
- School of Biology and Food Engineering, Fuyang Normal University, Fuyang, Anhui 236037, China
| | - Shuanglin Jiang
- School of Biology and Food Engineering, Fuyang Normal University, Fuyang, Anhui 236037, China
| | - Ming Xie
- North China Petroleum Bureau General Hospital, Renqiu 062550, China.
| | - Ran Liu
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Nanjing 210009, China.
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3
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Xu X, He X, Zhang Z, Chen Y, Li J, Ma S, Huang Q, Li M. CREB Inactivation by HDAC1/PP1γ Contributes to Dopaminergic Neurodegeneration in Parkinson's Disease. J Neurosci 2022; 42:4594-4604. [PMID: 35501151 PMCID: PMC9172078 DOI: 10.1523/jneurosci.1419-21.2022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2021] [Revised: 04/19/2022] [Accepted: 04/21/2022] [Indexed: 11/21/2022] Open
Abstract
Understanding the pathogenesis of nigral dopaminergic neurodegeneration is critical for developing mechanism-based treatments for Parkinson's disease (PD). In the nigral dopaminergic neurons of postmortem human PD brains, we found that CREB, a well-recognized pro-survival transcription factor in neurons, was inactivated by dephosphorylation at Ser133. CREB dephosphorylation correlated with decreased expression of NURR1, one of its target genes crucial for dopaminergic neuron survival, confirming that CREB function was impaired in nigral dopaminergic neurons in PD. An MPTP mouse model was used to further elucidate the mechanism underlying CREB dephosphorylation. Protein phosphatase 1γ (PP1γ), which dephosphorylates CREB, was constitutively associated with histone deacetylase 1 (HDAC1). HDAC1 promotes CREB Ser133 dephosphorylation via a stable interaction with PP1γ. We found that CREB interacted with the HDAC1/PP1γ complex during dopaminergic neurodegeneration. Importantly, increased CREB/HDAC1 interaction occurred in the nigral dopaminergic neurons of PD patients as demonstrated using a proximity ligation assay. Disrupting CREB/HDAC1 interaction via either overexpression of GAL4 M1, a CREB mutant, or administration of trichostatin A, a pan-HDAC inhibitor, restored the expression levels of phospho-CREB (Ser133) and NURR1, and protected nigral dopaminergic neurons in the MPTP-treated mouse brain. Collectively, our results demonstrated that HDAC1/PP1γ-mediated CREB inactivation contributed to dopaminergic neuronal degeneration. Disruption of CREB/HDAC1 interaction has the potential to be a new approach for PD therapy.SIGNIFICANCE STATEMENT Parkinson's disease (PD) is the most common movement disorder attributed to the progressive loss of dopaminergic neurons in the substantia nigra. Understanding the pathogenesis of nigral dopaminergic neurodegeneration is critical for developing mechanism-based treatments for PD. We found in nigral dopaminergic neurons of postmortem human PD brains that CREB, a well-recognized pro-survival transcription factor in neurons, was inactivated by dephosphorylation at Ser133. HDAC1, constitutively associated with PP1γ, interacted with CREB to mediate its dephosphorylation during dopaminergic neurodegeneration. Disrupting CREB/HDAC1 interaction restored CREB activity and protected nigral dopaminergic neurons in the MPTP mouse brains. This work suggests that disruption of the CREB/HDAC1 interaction to restore CREB activity may be a potential therapeutic approach in PD.
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Affiliation(s)
- Xiaoyi Xu
- Guangdong Provincial Key Laboratory of Brain Function and Disease and Department of Pharmacology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, 510080, China
| | - Xin He
- Guangdong Provincial Key Laboratory of Brain Function and Disease and Department of Pharmacology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, 510080, China
| | - Zeyan Zhang
- Guangdong Provincial Key Laboratory of Brain Function and Disease and Department of Pharmacology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, 510080, China
| | - Yanyi Chen
- Guangdong Provincial Key Laboratory of Brain Function and Disease and Department of Pharmacology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, 510080, China
| | - Junyu Li
- Guangdong Provincial Key Laboratory of Brain Function and Disease and Department of Pharmacology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, 510080, China
| | - Shanshan Ma
- Guangdong Provincial Key Laboratory of Brain Function and Disease and Department of Pharmacology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, 510080, China
| | - Qiaoying Huang
- Guangdong Provincial Key Laboratory of Brain Function and Disease and Department of Pharmacology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, 510080, China
| | - Mingtao Li
- Guangdong Provincial Key Laboratory of Brain Function and Disease and Department of Pharmacology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, 510080, China
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Gnedina OO, Morshneva AV, Skvortsova EV, Igotti MV. HDAC Inhibitor Sodium Butyrate Attenuates the DNA Repair in Transformed but Not in Normal Fibroblasts. Int J Mol Sci 2022; 23:ijms23073517. [PMID: 35408878 PMCID: PMC8998589 DOI: 10.3390/ijms23073517] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2022] [Revised: 03/19/2022] [Accepted: 03/21/2022] [Indexed: 11/30/2022] Open
Abstract
Many cancer therapy strategies cause DNA damage leading to the death of tumor cells. The DNA damage response (DDR) modulators are considered as promising candidates for use in combination therapy to enhance the efficacy of DNA-damage-mediated cancer treatment. The inhibitors of histone deacetylases (HDACis) exhibit selective antiproliferative effects against transformed and tumor cells and could enhance tumor cell sensitivity to genotoxic agents, which is partly attributed to their ability to interfere with DDR. Using the comet assay and host-cell reactivation of transcription, as well as γH2AX staining, we have shown that sodium butyrate inhibited DNA double-strand break (DSB) repair of both endo- and exogenous DNA in transformed but not in normal cells. According to our data, the dysregulation of the key repair proteins, especially the phosphorylated Mre11 pool decrease, is the cause of DNA repair impairment in transformed cells. The inability of HDACis to obstruct DSB repair in normal cells shown in this work demonstrates the advantages of HDACis in combination therapy with genotoxic agents to selectively enhance their cytotoxic activity in cancer cells.
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Short communication: TNF-α and IGF-1 regulates epigenetic mechanisms of HDAC2 and HDAC10. PLoS One 2022; 17:e0263190. [PMID: 35143520 PMCID: PMC8830685 DOI: 10.1371/journal.pone.0263190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Accepted: 01/13/2022] [Indexed: 11/19/2022] Open
Abstract
Vascular restenosis often presents as a consequence of injury to the vessel wall, resulting from stenting and other interventional procedures. Such injury to the arteries induces proliferation of Vascular Smooth Muscle Cells (VSMCs), resulting in cellular hyperplasia and restenosis. We and others have previously reported de-novo production of different cytokines and growth factors such as Tumor Necrosis Factor Alpha (TNF-α) and Insulin like Growth Factor 1 (IGF-1), after vascular injury. As complex as it is, the profuse proliferation of VSMCs appears to be occurring due to several induced factors which initiate molecular mechanisms and exacerbate disease conditions. In many pathological events, the deleterious effects of TNF-α and IGF-1 in initiating disease mechanisms was reported. In the present work, we explored whether TNF-α and IGF-1 can regulate epigenetic mechanisms that promote proliferation of VSMCs. We investigated the mechanistic roles of proteins which can structurally interact with DNMT1 and initiate cellular pathways that promote proliferation of VSMCs. Our findings here, identify a novel molecular mechanism that is initiated by TNF-α and IGF-1. It was previously reported that DNMT1 expression is directly induced by TNF-α and IGF-1 treatment and increased/induced expression of DNMT1 causes silencing of genes that are essential to maintaining cellular homeostasis such as the tumor suppressor genes. We have earlier reported that TNF-α and IGF-1 treatment elevates DNMT1 expression in VSMCs and causes increased VSMC proliferation. However, the molecular mechanisms involved were not fully deciphered. Interestingly, in the present study we found that TNF-α and IGF-1 treatment failed to elevate DNMT1 expression levels in absence of HDAC2 and HDAC10. Also, while HDAC2 expression was not affected by HDAC10 knockdown, HDAC2 is essentially required for HDAC10 expression. Further, in TNF-α and IGF-1 induced epigenetic signaling mechanism, the expression of two important proteins EZH2 and PCNA seem to be regulated in an HDAC2-HDAC10 dependent manner. Our results show an inter-dependence of epigenetic mediators in inducing proliferation in VSMCs. To our knowledge, this is the first report that shows HDAC2 dependent expression of HDAC10, and suggests a novel mechanistic link between DNMT1, HDAC10 and HDAC2 that regulates EZH2 and PCNA to enhance cell proliferation of VSMCs which is the underlying cause for neointimal hyperplasia and restenosis.
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Balmik AA, Chinnathambi S. Inter-relationship of Histone Deacetylase-6 with cytoskeletal organization and remodeling. Eur J Cell Biol 2022; 101:151202. [DOI: 10.1016/j.ejcb.2022.151202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2021] [Revised: 01/21/2022] [Accepted: 01/21/2022] [Indexed: 11/30/2022] Open
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Chang P, Li H, Hu H, Li Y, Wang T. The Role of HDAC6 in Autophagy and NLRP3 Inflammasome. Front Immunol 2021; 12:763831. [PMID: 34777380 PMCID: PMC8578992 DOI: 10.3389/fimmu.2021.763831] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Accepted: 09/28/2021] [Indexed: 12/12/2022] Open
Abstract
Autophagy fights against harmful stimuli and degrades cytosolic macromolecules, organelles, and intracellular pathogens. Autophagy dysfunction is associated with many diseases, including infectious and inflammatory diseases. Recent studies have identified the critical role of the NACHT, LRR, and PYD domain-containing protein 3 (NLRP3) inflammasomes activation in the innate immune system, which mediates the secretion of proinflammatory cytokines IL-1β/IL-18 and cleaves Gasdermin D to induce pyroptosis in response to pathogenic and sterile stimuli. Accumulating evidence has highlighted the crosstalk between autophagy and NLRP3 inflammasome in multifaceted ways to influence host defense and inflammation. However, the underlying mechanisms require further clarification. Histone deacetylase 6 (HDAC6) is a class IIb deacetylase among the 18 mammalian HDACs, which mainly localizes in the cytoplasm. It is involved in two functional deacetylase domains and a ubiquitin-binding zinc finger domain (ZnF-BUZ). Due to its unique structure, HDAC6 regulates various physiological processes, including autophagy and NLRP3 inflammasome, and may play a role in the crosstalk between them. In this review, we provide insight into the mechanisms by which HDAC6 regulates autophagy and NLRP3 inflammasome and we explored the possibility and challenges of HDAC6 in the crosstalk between autophagy and NLRP3 inflammasome. Finally, we discuss HDAC6 inhibitors as a potential therapeutic approach targeting either autophagy or NLRP3 inflammasome as an anti-inflammatory strategy, although further clarification is required regarding their crosstalk.
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Affiliation(s)
- Panpan Chang
- Trauma Medicine Center, Peking University People's Hospital, Key Laboratory of Trauma and Neural Regeneration (Peking University), National Center for Trauma Medicine of China, Beijing, China
| | - Hao Li
- Department of Emergency, First Hospital of China Medical University, Shenyang, China
| | - Hui Hu
- Department of Traumatology, Central Hospital of Chongqing University, Chongqing Emergency Medical Center, Chongqing, China
| | - Yongqing Li
- Department of Surgery, University of Michigan, Ann Arbor, MI, United States
| | - Tianbing Wang
- Trauma Medicine Center, Peking University People's Hospital, Key Laboratory of Trauma and Neural Regeneration (Peking University), National Center for Trauma Medicine of China, Beijing, China
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8
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Matos B, Howl J, Jerónimo C, Fardilha M. Modulation of serine/threonine-protein phosphatase 1 (PP1) complexes: A promising approach in cancer treatment. Drug Discov Today 2021; 26:2680-2698. [PMID: 34390863 DOI: 10.1016/j.drudis.2021.08.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2021] [Revised: 04/23/2021] [Accepted: 08/05/2021] [Indexed: 01/21/2023]
Abstract
Cancer is the second leading cause of death worldwide. Despite the availability of numerous therapeutic options, tumor heterogeneity and chemoresistance have limited the success of these treatments, and the development of effective anticancer therapies remains a major focus in oncology research. The serine/threonine-protein phosphatase 1 (PP1) and its complexes have been recognized as potential drug targets. Research on the modulation of PP1 complexes is currently at an early stage, but has immense potential. Chemically diverse compounds have been developed to disrupt or stabilize different PP1 complexes in various cancer types, with the objective of inhibiting disease progression. Beneficial results obtained in vitro now require further pre-clinical and clinical validation. In conclusion, the modulation of PP1 complexes seems to be a promising, albeit challenging, therapeutic strategy for cancer.
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Affiliation(s)
- Bárbara Matos
- Laboratory of Signal Transduction, Department of Medical Sciences, Institute of Biomedicine-iBiMED, University of Aveiro, 3810-193 Aveiro, Portugal; Cancer Biology and Epigenetics Group, IPO Porto Research Center (CI-IPOP), Portuguese Institute of Oncology of Porto (IPO Porto), 4200-072 Porto, Portugal
| | - John Howl
- Molecular Pharmacology Group, Research Institute in Healthcare Science, University of Wolverhampton, Wolverhampton WV1 1LY, UK
| | - Carmen Jerónimo
- Cancer Biology and Epigenetics Group, IPO Porto Research Center (CI-IPOP), Portuguese Institute of Oncology of Porto (IPO Porto), 4200-072 Porto, Portugal; Department of Pathology and Molecular Immunology, Institute of Biomedical Sciences Abel Salazar, University of Porto (ICBAS-UP), 4050-513 Porto, Portugal
| | - Margarida Fardilha
- Laboratory of Signal Transduction, Department of Medical Sciences, Institute of Biomedicine-iBiMED, University of Aveiro, 3810-193 Aveiro, Portugal.
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Gopalan J, Omar MH, Roy A, Cruz NM, Falcone J, Jones KN, Forbush KA, Himmelfarb J, Freedman BS, Scott JD. Targeting an anchored phosphatase-deacetylase unit restores renal ciliary homeostasis. eLife 2021; 10:e67828. [PMID: 34250905 PMCID: PMC8291974 DOI: 10.7554/elife.67828] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2021] [Accepted: 07/11/2021] [Indexed: 11/13/2022] Open
Abstract
Pathophysiological defects in water homeostasis can lead to renal failure. Likewise, common genetic disorders associated with abnormal cytoskeletal dynamics in the kidney collecting ducts and perturbed calcium and cAMP signaling in the ciliary compartment contribute to chronic kidney failure. We show that collecting ducts in mice lacking the A-Kinase anchoring protein AKAP220 exhibit enhanced development of primary cilia. Mechanistic studies reveal that AKAP220-associated protein phosphatase 1 (PP1) mediates this phenotype by promoting changes in the stability of histone deacetylase 6 (HDAC6) with concomitant defects in actin dynamics. This proceeds through a previously unrecognized adaptor function for PP1 as all ciliogenesis and cytoskeletal phenotypes are recapitulated in mIMCD3 knock-in cells expressing a phosphatase-targeting defective AKAP220-ΔPP1 mutant. Pharmacological blocking of local HDAC6 activity alters cilia development and reduces cystogenesis in kidney-on-chip and organoid models. These findings identify the AKAP220-PPI-HDAC6 pathway as a key effector in primary cilia development.
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Affiliation(s)
- Janani Gopalan
- Department of Pharmacology, University of WashingtonSeattleUnited States
| | - Mitchell H Omar
- Department of Pharmacology, University of WashingtonSeattleUnited States
| | - Ankita Roy
- Kidney Research Institute, Division of Nephrology, Department of Laboratory Medicine and Pathology, University of WashingtonSeattleUnited States
- Institute for Stem Cell and Regenerative Medicine, University of WashingtonSeattleUnited States
| | - Nelly M Cruz
- Kidney Research Institute, Division of Nephrology, Department of Laboratory Medicine and Pathology, University of WashingtonSeattleUnited States
- Institute for Stem Cell and Regenerative Medicine, University of WashingtonSeattleUnited States
| | - Jerome Falcone
- Department of Pharmacology, University of WashingtonSeattleUnited States
| | - Kiana N Jones
- Department of Pharmacology, University of WashingtonSeattleUnited States
| | | | - Jonathan Himmelfarb
- Kidney Research Institute, Division of Nephrology, Department of Laboratory Medicine and Pathology, University of WashingtonSeattleUnited States
| | - Benjamin S Freedman
- Kidney Research Institute, Division of Nephrology, Department of Laboratory Medicine and Pathology, University of WashingtonSeattleUnited States
- Institute for Stem Cell and Regenerative Medicine, University of WashingtonSeattleUnited States
| | - John D Scott
- Department of Pharmacology, University of WashingtonSeattleUnited States
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Histone deacetylase 10, a potential epigenetic target for therapy. Biosci Rep 2021; 41:228655. [PMID: 33997894 PMCID: PMC8182986 DOI: 10.1042/bsr20210462] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2021] [Revised: 05/13/2021] [Accepted: 05/14/2021] [Indexed: 11/17/2022] Open
Abstract
Histone deacetylase (HDAC) 10, a class II family, has been implicated in various tumors and non-tumor diseases, which makes the discovery of biological functions and novel inhibitors a fundamental endeavor. In cancers, HDAC10 plays crucial roles in regulating various cellular processes through its epigenetic functions or targeting some decisive molecular or signaling pathways. It also has potential clinical utility for targeting tumors and non-tumor diseases, such as renal cell carcinoma, prostate cancer, immunoglobulin A nephropathy (IgAN), intracerebral hemorrhage, human immunodeficiency virus (HIV) infection and schizophrenia. To date, relatively few studies have investigated HDAC10-specific inhibitors. Therefore, it is important to study the biological functions of HDAC10 for the future development of specific HDAC10 inhibitors. In this review, we analyzed the biological functions, mechanisms and inhibitors of HDAC10, which makes HDAC10 an appealing therapeutic target.
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11
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Complex functionality of protein phosphatase 1 isoforms in the heart. Cell Signal 2021; 85:110059. [PMID: 34062239 DOI: 10.1016/j.cellsig.2021.110059] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Revised: 05/21/2021] [Accepted: 05/28/2021] [Indexed: 02/04/2023]
Abstract
Protein phosphatase 1(PP1) is a key regulator of cardiac function through dephosphorylating serine/threonine residues within target proteins to oppose the function of protein kinases. Studies from failing hearts of animal models and human patients have demonstrated significant increase of PP1 activity in myocardium, while elevated PP1 activity in transgenic mice leads to cardiac dysfunction, suggesting that PP1 might be a therapeutic target to ameliorate cardiac dysfunction in failing hearts. In fact, cardiac overexpression of inhibitor 1, the endogenous inhibitor of PP1, increases cardiac contractility and suppresses heart failure progression. However, this notion of PP1 inhibition for heart failure treatment has been challenged by recent studies on the isoform-specific roles of PP1 in the heart. PP1 is a holoenzyme composed of catalytic subunits (PP1α, PP1β, or PP1γ) and regulatory proteins that target them to distinct subcellular locations for functional specificity. This review will summarize how PP1 regulates phosphorylation of some of the key cardiac proteins involved in Ca2+ handling and cardiac contraction, and the potential role of PP1 isoforms in controlling cardiac physiology and pathophysiology.
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12
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Balmik AA, Sonawane SK, Chinnathambi S. The extracellular HDAC6 ZnF UBP domain modulates the actin network and post-translational modifications of Tau. Cell Commun Signal 2021; 19:49. [PMID: 33933071 PMCID: PMC8088071 DOI: 10.1186/s12964-021-00736-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2020] [Accepted: 03/29/2021] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Microtubule-associated protein Tau undergoes aggregation in Alzheimer`s disease (AD) and a group of other related diseases collectively known as Tauopathies. In AD, Tau forms aggregates, which are deposited intracellularly as neurofibrillary tangles. Histone deacetylase-6 (HDAC6) plays an important role in aggresome formation, where it recruits polyubiquitinated aggregates to the motor protein dynein. METHODS Here, we have studied the effects of HDAC6 ZnF UBP on Tau phosphorylation, ApoE localization, GSK-3β regulation and cytoskeletal organization in neuronal cells by immunocytochemical analysis. This analysis reveals that the cell exposure to the UBP-type zinc finger domain of HDAC6 (HDAC6 ZnF UBP) can modulate Tau phosphorylation and actin cytoskeleton organization. RESULTS HDAC6 ZnF UBP treatment to cells did not affect their viability and resulted in enhanced neurite extension and formation of structures similar to podosomes, lamellipodia and podonuts suggesting the role of this domain in actin re-organization. Also, HDAC6 ZnF UBP treatment caused increase in nuclear localization of ApoE and tubulin localization in microtubule organizing centre (MTOC). Therefore, our studies suggest the regulatory role of this domain in different aspects of neurodegenerative diseases. Upon HDAC6 ZnF UBP treatment, inactive phosphorylated form of GSK-3β increases without any change in total GSK-3β level. CONCLUSIONS HDAC6 ZnF UBP was found to be involved in cytoskeletal re-organization by modulating actin dynamics and tubulin localization. Overall, our study suggests that ZnF domain of HDAC6 performs various regulatory functions apart from its classical function in aggresome formation in protein misfolding diseases. Video abstract.
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Affiliation(s)
- Abhishek Ankur Balmik
- Neurobiology Group, Division of Biochemical Sciences, CSIR-National Chemical Laboratory (CSIR-NCL), Dr. Homi Bhabha Road, Pune, 411008, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Shweta Kishor Sonawane
- Neurobiology Group, Division of Biochemical Sciences, CSIR-National Chemical Laboratory (CSIR-NCL), Dr. Homi Bhabha Road, Pune, 411008, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Subashchandrabose Chinnathambi
- Neurobiology Group, Division of Biochemical Sciences, CSIR-National Chemical Laboratory (CSIR-NCL), Dr. Homi Bhabha Road, Pune, 411008, India. .,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India.
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13
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Regulation of Synaptic Transmission and Plasticity by Protein Phosphatase 1. J Neurosci 2021; 41:3040-3050. [PMID: 33827970 DOI: 10.1523/jneurosci.2026-20.2021] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2020] [Revised: 02/08/2021] [Accepted: 02/09/2021] [Indexed: 01/22/2023] Open
Abstract
Protein phosphatases, by counteracting protein kinases, regulate the reversible phosphorylation of many substrates involved in synaptic plasticity, a cellular model for learning and memory. A prominent phosphatase regulating synaptic plasticity and neurologic disorders is the serine/threonine protein phosphatase 1 (PP1). PP1 has three isoforms (α, β, and γ, encoded by three different genes), which are regulated by a vast number of interacting subunits that define their enzymatic substrate specificity. In this review, we discuss evidence showing that PP1 regulates synaptic transmission and plasticity, as well as presenting novel models of PP1 regulation suggested by recent experimental evidence. We also outline the required targeting of PP1 by neurabin and spinophilin to achieve substrate specificity at the synapse to regulate AMPAR and NMDAR function. We then highlight the role of inhibitor-2 in regulating PP1 function in plasticity, including its positive regulation of PP1 function in vivo in memory formation. We also discuss the distinct function of the three PP1 isoforms in synaptic plasticity and brain function, as well as briefly discuss the role of inhibitory phosphorylation of PP1, which has received recent emphasis in the regulation of PP1 activity in neurons.
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14
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Zhao WN, Tobe BTD, Udeshi ND, Xuan LL, Pernia CD, Zolg DP, Roberts AJ, Mani D, Blumenthal SR, Kurtser I, Patnaik D, Gaisina I, Bishop J, Sheridan SD, Lalonde J, Carr SA, Snyder EY, Haggarty SJ. Discovery of suppressors of CRMP2 phosphorylation reveals compounds that mimic the behavioral effects of lithium on amphetamine-induced hyperlocomotion. Transl Psychiatry 2020; 10:76. [PMID: 32094324 PMCID: PMC7039883 DOI: 10.1038/s41398-020-0753-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/11/2019] [Revised: 11/08/2019] [Accepted: 11/21/2019] [Indexed: 12/12/2022] Open
Abstract
The effective treatment of bipolar disorder (BD) represents a significant unmet medical need. Although lithium remains a mainstay of treatment for BD, limited knowledge regarding how it modulates affective behavior has proven an obstacle to discovering more effective mood stabilizers with fewer adverse side effects. One potential mechanism of action of lithium is through inhibition of the serine/threonine protein kinase GSK3β, however, relevant substrates whose change in phosphorylation may mediate downstream changes in neuroplasticity remain poorly understood. Here, we used human induced pluripotent stem cell (hiPSC)-derived neuronal cells and stable isotope labeling by amino acids in cell culture (SILAC) along with quantitative mass spectrometry to identify global changes in the phosphoproteome upon inhibition of GSK3α/β with the highly selective, ATP-competitive inhibitor CHIR-99021. Comparison of phosphorylation changes to those induced by therapeutically relevant doses of lithium treatment led to the identification of collapsin response mediator protein 2 (CRMP2) as being highly sensitive to both treatments as well as an extended panel of structurally distinct GSK3α/β inhibitors. On this basis, a high-content image-based assay in hiPSC-derived neurons was developed to screen diverse compounds, including FDA-approved drugs, for their ability to mimic lithium's suppression of CRMP2 phosphorylation without directly inhibiting GSK3β kinase activity. Systemic administration of a subset of these CRMP2-phosphorylation suppressors were found to mimic lithium's attenuation of amphetamine-induced hyperlocomotion in mice. Taken together, these studies not only provide insights into the neural substrates regulated by lithium, but also provide novel human neuronal assays for supporting the development of mechanism-based therapeutics for BD and related neuropsychiatric disorders.
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Affiliation(s)
- Wen-Ning Zhao
- grid.32224.350000 0004 0386 9924Chemical Neurobiology Laboratory, Center for Genomic Medicine, Massachusetts General Hospital, 185 Cambridge Street, Boston, MA 02114 USA ,grid.32224.350000 0004 0386 9924Departments of Psychiatry & Neurology, Massachusetts General Hospital & Harvard Medical School, Boston, MA 02114 USA
| | - Brian T. D. Tobe
- grid.479509.60000 0001 0163 8573Center for Stem Cells & Regenerative Medicine, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA 92037 USA ,grid.266100.30000 0001 2107 4242Department of Psychiatry, University of California San Diego, La Jolla, CA 92037 USA ,grid.468218.1Sanford Consortium for Regenerative Medicine, La Jolla, CA 92037 USA ,Present Address: Kaiser Health, San Diego, CA USA
| | - Namrata D. Udeshi
- grid.38142.3c000000041936754XProteomics Platform, Broad Institute of MIT and Harvard University, Cambridge, MA 02142 USA
| | - Lucius L. Xuan
- grid.32224.350000 0004 0386 9924Chemical Neurobiology Laboratory, Center for Genomic Medicine, Massachusetts General Hospital, 185 Cambridge Street, Boston, MA 02114 USA ,grid.32224.350000 0004 0386 9924Departments of Psychiatry & Neurology, Massachusetts General Hospital & Harvard Medical School, Boston, MA 02114 USA
| | - Cameron D. Pernia
- grid.479509.60000 0001 0163 8573Center for Stem Cells & Regenerative Medicine, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA 92037 USA ,grid.468218.1Sanford Consortium for Regenerative Medicine, La Jolla, CA 92037 USA
| | - Daniel P. Zolg
- grid.32224.350000 0004 0386 9924Chemical Neurobiology Laboratory, Center for Genomic Medicine, Massachusetts General Hospital, 185 Cambridge Street, Boston, MA 02114 USA ,grid.32224.350000 0004 0386 9924Departments of Psychiatry & Neurology, Massachusetts General Hospital & Harvard Medical School, Boston, MA 02114 USA ,grid.6936.a0000000123222966Present Address: TUM School of Life Sciences, Technical University of Munich, Munich, Germany
| | - Amanda J. Roberts
- grid.468218.1Sanford Consortium for Regenerative Medicine, La Jolla, CA 92037 USA
| | - Deepak Mani
- grid.38142.3c000000041936754XProteomics Platform, Broad Institute of MIT and Harvard University, Cambridge, MA 02142 USA
| | - Sarah R. Blumenthal
- grid.32224.350000 0004 0386 9924Chemical Neurobiology Laboratory, Center for Genomic Medicine, Massachusetts General Hospital, 185 Cambridge Street, Boston, MA 02114 USA ,grid.32224.350000 0004 0386 9924Departments of Psychiatry & Neurology, Massachusetts General Hospital & Harvard Medical School, Boston, MA 02114 USA
| | - Iren Kurtser
- grid.32224.350000 0004 0386 9924Chemical Neurobiology Laboratory, Center for Genomic Medicine, Massachusetts General Hospital, 185 Cambridge Street, Boston, MA 02114 USA ,grid.32224.350000 0004 0386 9924Departments of Psychiatry & Neurology, Massachusetts General Hospital & Harvard Medical School, Boston, MA 02114 USA
| | - Debasis Patnaik
- grid.32224.350000 0004 0386 9924Chemical Neurobiology Laboratory, Center for Genomic Medicine, Massachusetts General Hospital, 185 Cambridge Street, Boston, MA 02114 USA ,grid.32224.350000 0004 0386 9924Departments of Psychiatry & Neurology, Massachusetts General Hospital & Harvard Medical School, Boston, MA 02114 USA
| | - Irina Gaisina
- grid.185648.60000 0001 2175 0319Department of Medicinal Chemistry & Pharmacognosy, College of Pharmacy, University of Illinois at Chicago, Chicago, IL 60612 USA
| | - Joshua Bishop
- grid.32224.350000 0004 0386 9924Chemical Neurobiology Laboratory, Center for Genomic Medicine, Massachusetts General Hospital, 185 Cambridge Street, Boston, MA 02114 USA ,grid.32224.350000 0004 0386 9924Departments of Psychiatry & Neurology, Massachusetts General Hospital & Harvard Medical School, Boston, MA 02114 USA ,grid.417993.10000 0001 2260 0793Present Address: Merck, Boston, MA USA
| | - Steven D. Sheridan
- grid.32224.350000 0004 0386 9924Chemical Neurobiology Laboratory, Center for Genomic Medicine, Massachusetts General Hospital, 185 Cambridge Street, Boston, MA 02114 USA ,grid.32224.350000 0004 0386 9924Departments of Psychiatry & Neurology, Massachusetts General Hospital & Harvard Medical School, Boston, MA 02114 USA
| | - Jasmin Lalonde
- grid.34429.380000 0004 1936 8198Department of Molecular and Cellular Biology, University of Guelph, 50 Stone Road, East, Guelph, ON Canada N1G 2W1
| | - Steven A. Carr
- grid.38142.3c000000041936754XProteomics Platform, Broad Institute of MIT and Harvard University, Cambridge, MA 02142 USA
| | - Evan Y. Snyder
- grid.479509.60000 0001 0163 8573Center for Stem Cells & Regenerative Medicine, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA 92037 USA ,grid.468218.1Sanford Consortium for Regenerative Medicine, La Jolla, CA 92037 USA ,grid.266100.30000 0001 2107 4242Department of Pediatrics, University of California San Diego, La Jolla, CA 92037 USA
| | - Stephen J. Haggarty
- grid.32224.350000 0004 0386 9924Chemical Neurobiology Laboratory, Center for Genomic Medicine, Massachusetts General Hospital, 185 Cambridge Street, Boston, MA 02114 USA ,grid.32224.350000 0004 0386 9924Departments of Psychiatry & Neurology, Massachusetts General Hospital & Harvard Medical School, Boston, MA 02114 USA
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15
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Rossaert E, Van Den Bosch L. HDAC6 inhibitors: Translating genetic and molecular insights into a therapy for axonal CMT. Brain Res 2020; 1733:146692. [PMID: 32006555 DOI: 10.1016/j.brainres.2020.146692] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2019] [Revised: 01/24/2020] [Accepted: 01/27/2020] [Indexed: 12/25/2022]
Abstract
Histone deacetylase 6 (HDAC6) plays a central role in various processes that are key for neuronal survival. In this review, we summarize the current evidence related to disease pathways in the axonal form of Charcot-Marie-Tooth disease (CMT) and highlight the role of HDAC6 in these pathways. We hypothesize that HDAC6 might in fact actively contribute to the pathogenesis of certain forms of axonal CMT. HDAC6 plays a deacetylase activity-dependent, negative role in axonal transport and axonal regeneration, which are both processes implicated in axonal CMT. On the other hand, HDAC6 coordinates a protective response during elimination of toxic misfolded proteins, but this is mostly mediated independent of its deacetylase activity. The current mechanistic insights on these functions of HDAC6 in axonal CMT, along with the selective druggability against its deacetylase activity, make the targeting of HDAC6 particularly attractive. We elaborate on the preclinical studies that demonstrated beneficial effects of HDAC6 inhibitors in axonal CMT models and outline possible modes of action. Overall, this overview ultimately provides a rationale for the use of small-molecule HDAC6 inhibitors as a therapeutic strategy for this devastating disease.
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Affiliation(s)
- Elisabeth Rossaert
- KU Leuven - University of Leuven, Department of Neurosciences, Experimental Neurology and Leuven Brain Institute (LBI), Leuven, Belgium; VIB - Center for Brain & Disease Research, Laboratory of Neurobiology, Leuven, Belgium
| | - Ludo Van Den Bosch
- KU Leuven - University of Leuven, Department of Neurosciences, Experimental Neurology and Leuven Brain Institute (LBI), Leuven, Belgium; VIB - Center for Brain & Disease Research, Laboratory of Neurobiology, Leuven, Belgium.
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16
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Dwivedi SKD, Shameer K, Dey A, Mustafi SB, Xiong X, Bhattacharya U, Neizer-Ashun F, Rao G, Wang Y, Ivan C, Yang D, Dudley JT, Xu C, Wren JD, Mukherjee P, Bhattacharya R. KRCC1: A potential therapeutic target in ovarian cancer. FASEB J 2019; 34:2287-2300. [PMID: 31908025 DOI: 10.1096/fj.201902259r] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Revised: 11/14/2019] [Accepted: 11/25/2019] [Indexed: 01/11/2023]
Abstract
Using a systems biology approach to prioritize potential points of intervention in ovarian cancer, we identified the lysine rich coiled-coil 1 (KRCC1), as a potential target. High-grade serous ovarian cancer patient tumors and cells express significantly higher levels of KRCC1 which correlates with poor overall survival and chemoresistance. We demonstrate that KRCC1 is predominantly present in the chromatin-bound nuclear fraction, interacts with HDAC1, HDAC2, and with the serine-threonine phosphatase PP1CC. Silencing KRCC1 inhibits cellular plasticity, invasive properties, and potentiates apoptosis resulting in reduced tumor growth. These phenotypes are associated with increased acetylation of histones and with increased phosphorylation of H2AX and CHK1, suggesting the modulation of transcription and DNA damage that may be mediated by the action of HDAC and PP1CC, respectively. Hence, we address an urgent need to develop new targets in cancer.
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Affiliation(s)
| | - Khader Shameer
- Institute of Next Generation Healthcare (INGH), Icahn Institute for Data Science and Genomic Technology, Department of Genetics and Genomic Sciences, Mount Sinai Health System, New York, NY, USA
| | - Anindya Dey
- Department of Obstetrics and Gynecology, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA
| | | | - Xunhao Xiong
- Department of Pathology, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA
| | - Udayan Bhattacharya
- Department of Obstetrics and Gynecology, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA
| | - Fiifi Neizer-Ashun
- Department of Obstetrics and Gynecology, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA
| | - Geeta Rao
- Department of Pathology, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA
| | - Yue Wang
- Center for Pharmacogenetics, Department of Pharmaceutical Sciences, University of Pittsburgh, Pittsburgh, PA, USA
| | - Cristina Ivan
- Department of Experimental Therapeutics & Center for RNA Interference and Non-coding RNA, The University of Texas M. D. Anderson Cancer Center, Houston, TX, USA
| | - Da Yang
- Center for Pharmacogenetics, Department of Pharmaceutical Sciences, University of Pittsburgh, Pittsburgh, PA, USA
| | - Joel T Dudley
- Institute of Next Generation Healthcare (INGH), Icahn Institute for Data Science and Genomic Technology, Department of Genetics and Genomic Sciences, Mount Sinai Health System, New York, NY, USA
| | - Chao Xu
- Department of Biostatistics and Epidemiology, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA
| | - Jonathan D Wren
- Departments of Biochemistry & Molecular Biology and Geriatric Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA
| | - Priyabrata Mukherjee
- Department of Pathology, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA.,Peggy and Charles Stephenson Cancer Center, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, USA
| | - Resham Bhattacharya
- Department of Obstetrics and Gynecology, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA.,Peggy and Charles Stephenson Cancer Center, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, USA
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17
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Brautigan DL, Shenolikar S. Protein Serine/Threonine Phosphatases: Keys to Unlocking Regulators and Substrates. Annu Rev Biochem 2019; 87:921-964. [PMID: 29925267 DOI: 10.1146/annurev-biochem-062917-012332] [Citation(s) in RCA: 110] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Protein serine/threonine phosphatases (PPPs) are ancient enzymes, with distinct types conserved across eukaryotic evolution. PPPs are segregated into types primarily on the basis of the unique interactions of PPP catalytic subunits with regulatory proteins. The resulting holoenzymes dock substrates distal to the active site to enhance specificity. This review focuses on the subunit and substrate interactions for PPP that depend on short linear motifs. Insights about these motifs from structures of holoenzymes open new opportunities for computational biology approaches to elucidate PPP networks. There is an expanding knowledge base of posttranslational modifications of PPP catalytic and regulatory subunits, as well as of their substrates, including phosphorylation, acetylation, and ubiquitination. Cross talk between these posttranslational modifications creates PPP-based signaling. Knowledge of PPP complexes, signaling clusters, as well as how PPPs communicate with each other in response to cellular signals should unlock the doors to PPP networks and signaling "clouds" that orchestrate and coordinate different aspects of cell physiology.
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Affiliation(s)
- David L Brautigan
- Center for Cell Signaling and Department of Microbiology, Immunology and Cancer Biology, University of Virginia School of Medicine, Charlottesville, Virginia 22908, USA;
| | - Shirish Shenolikar
- Signature Research Programs in Cardiovascular and Metabolic Disorders and Neuroscience and Behavioral Disorders, Duke-NUS Medical School, Singapore 169857
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18
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Cao Y, Banks DA, Mattei AM, Riddick AT, Reed KM, Zhang AM, Pickering ES, Hinton SD. Pseudophosphatase MK-STYX Alters Histone Deacetylase 6 Cytoplasmic Localization, Decreases Its Phosphorylation, and Increases Detyrosination of Tubulin. Int J Mol Sci 2019; 20:ijms20061455. [PMID: 30909412 PMCID: PMC6470616 DOI: 10.3390/ijms20061455] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2019] [Revised: 03/14/2019] [Accepted: 03/19/2019] [Indexed: 12/14/2022] Open
Abstract
The catalytically inactive mitogen-activated protein (MAP) kinase phosphatase, MK-STYX (MAPK (mitogen-activated protein kinase) phosphoserine/threonine/tyrosine-binding protein) interacts with the stress granule nucleator G3BP-1 (Ras-GAP (GTPase-activating protein) SH3 (Src homology 3) domain-binding protein-1), and decreases stress granule (stalled mRNA) formation. Histone deacetylase isoform 6 (HDAC6) also binds G3BP-1 and serves as a major component of stress granules. The discovery that MK-STYX and HDAC6 both interact with G3BP-1 led us to investigate the effects of MK-STYX on HDAC6 dynamics. In control HEK/293 cells, HDAC6 was cytosolic, as expected, and formed aggregates under conditions of stress. In contrast, in cells overexpressing MK-STYX, HDAC6 was both nuclear and cytosolic and the number of stress-induced aggregates significantly decreased. Immunoblots showed that MK-STYX decreases HDAC6 serine phosphorylation, protein tyrosine phosphorylation, and lysine acetylation. HDAC6 is known to regulate microtubule dynamics to form aggregates. MK-STYX did not affect the organization of microtubules, but did affect their post-translational modification. Tubulin acetylation was increased in the presence of MK-STYX. In addition, the detyrosination of tubulin was significantly increased in the presence of MK-STYX. These findings show that MK-STYX decreases the number of HDAC6-containing aggregates and alters their localization, sustains microtubule acetylation, and increases detyrosination of microtubules, implicating MK-STYX as a signaling molecule in HDAC6 activity.
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Affiliation(s)
- Yuming Cao
- Department of Biology, Integrated Science Center, College of William and Mary, Williamsburg, VA 23185, USA.
| | - Dallas A Banks
- Department of Biology, Integrated Science Center, College of William and Mary, Williamsburg, VA 23185, USA.
- Department of Cell Biology and Molecular Genetics, University of Maryland, College Park, MD 20742, USA.
| | - Andrew M Mattei
- Department of Biology, Integrated Science Center, College of William and Mary, Williamsburg, VA 23185, USA.
| | - Alexys T Riddick
- Department of Biology, Integrated Science Center, College of William and Mary, Williamsburg, VA 23185, USA.
| | - Kirstin M Reed
- Department of Biology, Integrated Science Center, College of William and Mary, Williamsburg, VA 23185, USA.
| | - Ashley M Zhang
- Department of Biology, Integrated Science Center, College of William and Mary, Williamsburg, VA 23185, USA.
| | - Emily S Pickering
- Department of Biology, Integrated Science Center, College of William and Mary, Williamsburg, VA 23185, USA.
| | - Shantá D Hinton
- Department of Biology, Integrated Science Center, College of William and Mary, Williamsburg, VA 23185, USA.
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19
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Profiling Signaling Proteins in Sertoli Cells by Co-immunoprecipitation. Methods Mol Biol 2018. [PMID: 29453566 DOI: 10.1007/978-1-4939-7698-0_7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
Abstract
Sertoli cells are crucial for germ cell support, create a suitable environment for spermatogenesis, and integrate information from the nervous system and germ cell line. To fully understand the role of Sertoli cells, it is necessary to characterize the protein-protein interactions. Identifying the interactome of a given protein may provide leads about the role and molecular mechanism of such protein in Sertoli cells. One of the techniques to characterize protein interactomes consists of co-immunoprecipitation followed by mass spectrometry or Western blot. Co-immunoprecipitation enables the isolation of a protein target and interactome under physiological conditions. In this chapter, we described how to perform an interactomic study using the co-immunoprecipitation technique in Sertoli cells. Moreover, we will focus on how to analyze and interpret the results of a co-immunoprecipitation before mass spectrometry analysis.
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20
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Balliu M, Cellai C, Lulli M, Laurenzana A, Torre E, Vannucchi AM, Paoletti F. HDAC1 controls CIP2A transcription in human colorectal cancer cells. Oncotarget 2017; 7:25862-71. [PMID: 27029072 PMCID: PMC5041950 DOI: 10.18632/oncotarget.8406] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2016] [Accepted: 03/10/2016] [Indexed: 12/03/2022] Open
Abstract
This work describes the effectiveness of HDAC-inhibitor (S)-2 towards colorectal cancer (CRC) HCT116 cells in vitro by inducing cell cycle arrest and apoptosis, and in vivo by contrasting tumour growth in mice xenografts. Among the multifaceted drug-induced events described herein, an interesting link has emerged between the oncoprotein histone deacetylase HDAC1 and the oncogenic Cancerous Inhibitor of Protein Phosphatase 2A (CIP2A) which is overexpressed in several cancers including CRCs. HDAC1 inhibition by (S)-2 or specific siRNAs downregulates CIP2A transcription in three different CRC cell lines, thus restoring the oncosuppressor phosphatase PP2A activity that is reduced in most cancers. Once re-activated, PP2A dephosphorylates pGSK-3β(ser9) which phosphorylates β-catenin that remains within the cytosol where it undergoes degradation. The decreased amount/activity of β-catenin transcription factor prompts cell growth arrest by diminishing c-Myc and cyclin D1 expression and abrogating the prosurvival Wnt/β-catenin signaling pathway. These results are the first evidence that the inhibition of HDAC1 by (S)-2 downregulates CIP2A transcription and unleashes PP2A activity, thus inducing growth arrest and apoptosis in CRC cells.
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Affiliation(s)
- Manjola Balliu
- Department of Experimental and Clinical Medicine, University of Florence, 50134 Firenze, Italy
| | - Cristina Cellai
- Department of Biomedical, Experimental and Clinical Sciences "Mario Serio", 50134 Firenze, Italy
| | - Matteo Lulli
- Department of Biomedical, Experimental and Clinical Sciences "Mario Serio", 50134 Firenze, Italy
| | - Anna Laurenzana
- Department of Biomedical, Experimental and Clinical Sciences "Mario Serio", 50134 Firenze, Italy
| | - Eugenio Torre
- Department of Biomedical, Experimental and Clinical Sciences "Mario Serio", 50134 Firenze, Italy
| | | | - Francesco Paoletti
- Department of Biomedical, Experimental and Clinical Sciences "Mario Serio", 50134 Firenze, Italy
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21
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Oxidative stress promotes SIRT1 recruitment to the GADD34/PP1α complex to activate its deacetylase function. Cell Death Differ 2017; 25:255-267. [PMID: 28984870 DOI: 10.1038/cdd.2017.152] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2017] [Revised: 08/01/2017] [Accepted: 08/15/2017] [Indexed: 12/20/2022] Open
Abstract
Phosphorylation of the eukaryotic translation initiation factor, eIF2α, by stress-activated protein kinases and dephosphorylation by the growth arrest and DNA damage-inducible protein (GADD34)-containing phosphatase is a central node in the integrated stress response. Mass spectrometry demonstrated GADD34 acetylation at multiple lysines. Substituting K315 and K322 with alanines or glutamines did not impair GADD34's ability to recruit protein phosphatase 1α (PP1α) or eIF2α, suggesting that GADD34 acetylation did not modulate eIF2α phosphatase activity. Arsenite (Ars)-induced oxidative stress increased cellular GADD34 levels and enhanced Sirtuin 1 (SIRT1) recruitment to assemble a cytoplasmic complex containing GADD34, PP1α, eIF2α and SIRT1. Induction of GADD34 in WT MEFs paralleled the dephosphorylation of eIF2α (phosphoserine-51) and SIRT1 (phosphoserine-47). By comparison, eIF2α and SIRT1 were persistently phosphorylated in Ars-treated GADD34-/- MEFs. Expressing WT GADD34, but not a mutant unable to bind PP1α in GADD34-/- MEFs restored both eIF2α and SIRT1 dephosphorylation. SIRT1 dephosphorylation increased its deacetylase activity, measured in vitro and in cells. Loss of function of GADD34 or SIRT1 enhanced cellular p-eIF2α levels and attenuated cell death following Ars exposure. These results highlighted a novel role for the GADD34/PP1α complex in coordinating the dephosphorylation and reactivation of eIF2α and SIRT1 to determine cell fate following oxidative stress.
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22
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Mao CX, Wen X, Jin S, Zhang YQ. Increased acetylation of microtubules rescues human tau-induced microtubule defects and neuromuscular junction abnormalities in Drosophila. Dis Model Mech 2017; 10:1245-1252. [PMID: 28819043 PMCID: PMC5665452 DOI: 10.1242/dmm.028316] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2016] [Accepted: 08/11/2017] [Indexed: 12/31/2022] Open
Abstract
Tau normally associates with and stabilizes microtubules (MTs), but is hyperphosphorylated and aggregated into neurofibrillary tangles in Alzheimer's disease and related neurodegenerative diseases, which are collectively known as tauopathies. MTs are regulated by different forms of post-translational modification, including acetylation; acetylated MTs represent a more stable microtubule population. In our previous study, we showed that inhibition of histone deacetylase 6 (HDAC6), which deacetylates tubulin at lysine 40, rescues defects in MTs and in neuromuscular junction growth caused by tau overexpression. However, HDAC6 also acts on other proteins that are involved in distinct biological processes unrelated to tubulins. In order to examine directly the role of increased tubulin acetylation against tau toxicity, we generated a site-directed α-tubulinK40Q mutation by CRISPR/Cas9 technology to mimic the acetylated MTs and found that acetylation-mimicking α-tubulin rescued tau-induced MT defects and neuromuscular junction developmental abnormalities. We also showed that late administration of ACY-1215 and tubastatin A, two potent and selective inhibitors of HDAC6, rescued the tau-induced MT defects after the abnormalities had already become apparent. Overall, our results indicate that increasing MT acetylation by either genetic manipulations or drugs might be used as potential strategies for intervention in tauopathies. Highlighted Article: Increased acetylation of microtubules by genetic and pharmacological approaches rescues human tau overexpression-induced toxicity in Drosophila muscles and neurons.
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Affiliation(s)
- Chuan-Xi Mao
- Key Laboratory of Molecular and Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China
| | - Xue Wen
- College of Life Sciences, Hubei University, Wuhan, Hubei 430062, China.,Hubei Collaborative Innovation Center for Green Transformation of Bio-Resources, Hubei University, Wuhan, Hubei 430062, China
| | - Shan Jin
- College of Life Sciences, Hubei University, Wuhan, Hubei 430062, China .,Hubei Collaborative Innovation Center for Green Transformation of Bio-Resources, Hubei University, Wuhan, Hubei 430062, China
| | - Yong Q Zhang
- Key Laboratory of Molecular and Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China .,University of the Chinese Academy of Sciences, Beijing 100049, China
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23
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Bartalucci N, Calabresi L, Balliu M, Martinelli S, Rossi MC, Villeval JL, Annunziato F, Guglielmelli P, Vannucchi AM. Inhibitors of the PI3K/mTOR pathway prevent STAT5 phosphorylation in JAK2V617F mutated cells through PP2A/CIP2A axis. Oncotarget 2017; 8:96710-96724. [PMID: 29228564 PMCID: PMC5722516 DOI: 10.18632/oncotarget.18073] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2017] [Accepted: 05/10/2017] [Indexed: 12/14/2022] Open
Abstract
Inhibition of the constitutively activated JAK/STAT pathway in JAK2V617F mutated cells by the JAK1/JAK2 inhibitor ruxolitinib resulted in clinical benefits in patients with myeloproliferative neoplasms. However, evidence of disease-modifying effects remains scanty; furthermore, some patients do not respond adequately to ruxolitinib, or have transient responses, thus novel treatment strategies are needed. Here we demonstrate that ruxolitinib causes incomplete inhibition of STAT5 in JAK2V617F mutated cells due to persistence of phosphorylated serine residues of STAT5b, that conversely are targeted by PI3K and mTORC1 inhibitors. We found that PI3K/mTOR-dependent phosphorylation of STAT5b serine residues involves Protein Phosphatase 2A and its repressor CIP2A. The levels of CIP2A were found increased in cells harboring the JAK2V617F mutation, and we provide evidence of a correlation between clinical responses and the extent of CIP2A downregulation in myelofibrosis patients receiving the mTOR inhibitor RAD001 in a phase II clinical trial. To achieve maximal inhibition of STAT5 phosphorylation, we combined ruxolitinib with BKM120, a PI3K inhibitor, and RAD001, an mTOR inhibitor, obtaining improved efficacy in JAK2V617F mutated cell lines, primary patients’ cells, and JAK2V617F knock-in mice. These findings contribute to understanding the effectiveness of PI3K/mTOR inhibitors in MPN and argue for the rationale to develop combination clinical trials.
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Affiliation(s)
- Niccolò Bartalucci
- CRIMM, Centro di Ricerca e Innovazione per le Malattie Mieloproliferative, Azienda Ospedaliera Universitaria Careggi, Florence, Italy.,Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy.,DENOTHE Excellence Center, Florence, Italy
| | - Laura Calabresi
- CRIMM, Centro di Ricerca e Innovazione per le Malattie Mieloproliferative, Azienda Ospedaliera Universitaria Careggi, Florence, Italy.,Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy.,DENOTHE Excellence Center, Florence, Italy
| | - Manjola Balliu
- CRIMM, Centro di Ricerca e Innovazione per le Malattie Mieloproliferative, Azienda Ospedaliera Universitaria Careggi, Florence, Italy.,Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy.,DENOTHE Excellence Center, Florence, Italy
| | - Serena Martinelli
- CRIMM, Centro di Ricerca e Innovazione per le Malattie Mieloproliferative, Azienda Ospedaliera Universitaria Careggi, Florence, Italy.,Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy.,DENOTHE Excellence Center, Florence, Italy
| | - Maria Caterina Rossi
- Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy.,DENOTHE Excellence Center, Florence, Italy
| | - Jean Luc Villeval
- INSERM, Unité Mixte de Recherche (UMR) 1170, Institut Gustave Roussy, Villejuif, France
| | - Francesco Annunziato
- Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy.,DENOTHE Excellence Center, Florence, Italy
| | - Paola Guglielmelli
- CRIMM, Centro di Ricerca e Innovazione per le Malattie Mieloproliferative, Azienda Ospedaliera Universitaria Careggi, Florence, Italy.,Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy.,DENOTHE Excellence Center, Florence, Italy
| | - Alessandro M Vannucchi
- CRIMM, Centro di Ricerca e Innovazione per le Malattie Mieloproliferative, Azienda Ospedaliera Universitaria Careggi, Florence, Italy.,Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy.,DENOTHE Excellence Center, Florence, Italy
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24
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Woldemichael BT, Jawaid A, Kremer EA, Gaur N, Krol J, Marchais A, Mansuy IM. The microRNA cluster miR-183/96/182 contributes to long-term memory in a protein phosphatase 1-dependent manner. Nat Commun 2016; 7:12594. [PMID: 27558292 PMCID: PMC5007330 DOI: 10.1038/ncomms12594] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2016] [Accepted: 07/13/2016] [Indexed: 12/24/2022] Open
Abstract
Memory formation is a complex cognitive function regulated by coordinated synaptic and nuclear processes in neurons. In mammals, it is controlled by multiple molecular activators and suppressors, including the key signalling regulator, protein phosphatase 1 (PP1). Here, we show that memory control by PP1 involves the miR-183/96/182 cluster and its selective regulation during memory formation. Inhibiting nuclear PP1 in the mouse brain, or training on an object recognition task similarly increases miR-183/96/182 expression in the hippocampus. Mimicking this increase by miR-183/96/182 overexpression enhances object memory, while knocking-down endogenous miR-183/96/182 impairs it. This effect involves the modulation of several plasticity-related genes, with HDAC9 identified as an important functional target. Further, PP1 controls miR-183/96/182 in a transcription-independent manner through the processing of their precursors. These findings provide novel evidence for a role of miRNAs in memory formation and suggest the implication of PP1 in miRNAs processing in the adult brain.
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Affiliation(s)
- Bisrat T Woldemichael
- Laboratory of Neuroepigenetics, University of Zurich/Swiss Federal Institute of Technology, Brain Research Institute, Neuroscience Center Zürich, Zurich CH-8057, Switzerland
| | - Ali Jawaid
- Laboratory of Neuroepigenetics, University of Zurich/Swiss Federal Institute of Technology, Brain Research Institute, Neuroscience Center Zürich, Zurich CH-8057, Switzerland
| | - Eloïse A Kremer
- Laboratory of Neuroepigenetics, University of Zurich/Swiss Federal Institute of Technology, Brain Research Institute, Neuroscience Center Zürich, Zurich CH-8057, Switzerland
| | - Niharika Gaur
- Laboratory of Neuroepigenetics, University of Zurich/Swiss Federal Institute of Technology, Brain Research Institute, Neuroscience Center Zürich, Zurich CH-8057, Switzerland
| | - Jacek Krol
- Friedrich Miescher Institute for Biomedical Research, Basel CH-4048, Switzerland
| | - Antonin Marchais
- Institute of Agricultural Sciences, Swiss Federal Institute of Technology, Zurich CH-8092, Switzerland
| | - Isabelle M Mansuy
- Laboratory of Neuroepigenetics, University of Zurich/Swiss Federal Institute of Technology, Brain Research Institute, Neuroscience Center Zürich, Zurich CH-8057, Switzerland
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25
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Manal M, Chandrasekar M, Gomathi Priya J, Nanjan M. Inhibitors of histone deacetylase as antitumor agents: A critical review. Bioorg Chem 2016; 67:18-42. [DOI: 10.1016/j.bioorg.2016.05.005] [Citation(s) in RCA: 143] [Impact Index Per Article: 17.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2016] [Revised: 04/29/2016] [Accepted: 05/15/2016] [Indexed: 12/11/2022]
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26
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Rebelo S, Santos M, Martins F, da Cruz e Silva EF, da Cruz e Silva OA. Protein phosphatase 1 is a key player in nuclear events. Cell Signal 2015; 27:2589-98. [DOI: 10.1016/j.cellsig.2015.08.007] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2015] [Revised: 07/31/2015] [Accepted: 08/10/2015] [Indexed: 12/17/2022]
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27
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Silva JV, Freitas MJ, Felgueiras J, Fardilha M. The power of the yeast two-hybrid system in the identification of novel drug targets: building and modulating PPP1 interactomes. Expert Rev Proteomics 2015; 12:147-58. [PMID: 25795147 DOI: 10.1586/14789450.2015.1024226] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Since the description of the yeast two-hybrid (Y2H) method, it has become more and more evident that it is the most commonly used method to identify protein-protein interactions (PPIs). The improvements in the original Y2H methodology in parallel with the idea that PPIs are promising drug targets, offer an excellent opportunity to apply the principles of this molecular biology technique to the pharmaceutical field. Additionally, the theoretical developments in the networks field make PPI networks very useful frameworks that facilitate many discoveries in biomedicine. This review highlights the relevance of Y2H in the determination of PPIs, specifically phosphoprotein phosphatase 1 interactions, and its possible outcomes in pharmaceutical research.
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Affiliation(s)
- Joana Vieira Silva
- Signal Transduction Laboratory, Institute for Research in Biomedicine - iBiMED, Health Sciences Program, University of Aveiro, Aveiro, Portugal
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28
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Singh P, Tomar RS, Rath SK. Anticancer potential of the histone deacetylase inhibitor-like effects of flavones, a subclass of polyphenolic compounds: a review. Mol Biol Rep 2015; 42:1515-31. [PMID: 26033434 DOI: 10.1007/s11033-015-3881-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2013] [Accepted: 10/30/2014] [Indexed: 12/26/2022]
Abstract
Cancer is characterized by the uncontrolled division of cells, followed by their invasion to other tissues. These kinds of cellular abnormalities arise as a result of the accumulation of genetic mutations or epigenetic alterations. Targeting genetic mutations by drugs is a conventional treatment approach. Nowadays, the development and use of epigenetic drugs are burgeoning, owing to the advancements in epigenetic research. The therapeutic intervention of cancer development by histone deacetylase inhibitors (HDACIs) holds promise for helping to control the disease, but their nonspecific functions impose certain side effects. Therefore, the search for more HDACIs becomes essential. Plentiful literature on the versatility of dietary components including flavones, a class of the flavonoid group, has already established these compounds to be better anticancer agents. The present review focuses on the significance of flavones with regard to their HDACI-mimicking effects as suggested by the recent evidences. The review also proposes an in-depth screening of flavones in future studies, in the hope that flavones may provide a better alternative to synthetic HDACIs.
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Affiliation(s)
- Prabhat Singh
- Department of Biological Sciences, Indian Institute of Science Education & Research Bhopal (IISER Bhopal), I.T.I. Transit Campus, Govindpura, Bhopal, 462023, M.P., India.
| | - Raghuvir Singh Tomar
- Department of Biological Sciences, Indian Institute of Science Education & Research Bhopal (IISER Bhopal), I.T.I. Transit Campus, Govindpura, Bhopal, 462023, M.P., India
| | - Srikanta Kumar Rath
- Division of Toxicology, CSIR-Central Drug Research Institute, Lucknow, India
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29
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Pinz S, Unser S, Buob D, Fischer P, Jobst B, Rascle A. Deacetylase inhibitors repress STAT5-mediated transcription by interfering with bromodomain and extra-terminal (BET) protein function. Nucleic Acids Res 2015; 43:3524-45. [PMID: 25769527 PMCID: PMC4402521 DOI: 10.1093/nar/gkv188] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2014] [Accepted: 02/23/2015] [Indexed: 12/21/2022] Open
Abstract
Signal transducer and activator of transcription STAT5 is essential for the regulation of proliferation and survival genes. Its activity is tightly regulated through cytokine signaling and is often upregulated in cancer. We showed previously that the deacetylase inhibitor trichostatin A (TSA) inhibits STAT5-mediated transcription by preventing recruitment of the transcriptional machinery at a step following STAT5 binding to DNA. The mechanism and factors involved in this inhibition remain unknown. We now show that deacetylase inhibitors do not target STAT5 acetylation, as we initially hypothesized. Instead, they induce a rapid increase in global histone acetylation apparently resulting in the delocalization of the bromodomain and extra-terminal (BET) protein Brd2 and of the Brd2-associated factor TBP to hyperacetylated chromatin. Treatment with the BET inhibitor (+)-JQ1 inhibited expression of STAT5 target genes, supporting a role of BET proteins in the regulation of STAT5 activity. Accordingly, chromatin immunoprecipitation demonstrated that Brd2 is associated with the transcriptionally active STAT5 target gene Cis and is displaced upon TSA treatment. Our data therefore indicate that Brd2 is required for the proper recruitment of the transcriptional machinery at STAT5 target genes and that deacetylase inhibitors suppress STAT5-mediated transcription by interfering with Brd2 function.
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Affiliation(s)
- Sophia Pinz
- Stat5 Signaling Research Group, Institute of Immunology, University of Regensburg, 93053 Regensburg, Germany
| | - Samy Unser
- Stat5 Signaling Research Group, Institute of Immunology, University of Regensburg, 93053 Regensburg, Germany
| | - Dominik Buob
- Stat5 Signaling Research Group, Institute of Immunology, University of Regensburg, 93053 Regensburg, Germany
| | - Philipp Fischer
- Stat5 Signaling Research Group, Institute of Immunology, University of Regensburg, 93053 Regensburg, Germany
| | - Belinda Jobst
- Stat5 Signaling Research Group, Institute of Immunology, University of Regensburg, 93053 Regensburg, Germany
| | - Anne Rascle
- Stat5 Signaling Research Group, Institute of Immunology, University of Regensburg, 93053 Regensburg, Germany
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30
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Felgueiras J, Fardilha M. Phosphoprotein phosphatase 1-interacting proteins as therapeutic targets in prostate cancer. World J Pharmacol 2014; 3:120-139. [DOI: 10.5497/wjp.v3.i4.120] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/29/2014] [Revised: 09/01/2014] [Accepted: 09/24/2014] [Indexed: 02/06/2023] Open
Abstract
Prostate cancer is a major public health concern worldwide, being one of the most prevalent cancers in men. Great improvements have been made both in terms of early diagnosis and therapeutics. However, there is still an urgent need for reliable biomarkers that could overcome the lack of cancer-specificity of prostate-specific antigen, as well as alternative therapeutic targets for advanced metastatic cases. Reversible phosphorylation of proteins is a post-translational modification critical to the regulation of numerous cellular processes. Phosphoprotein phosphatase 1 (PPP1) is a major serine/threonine phosphatase, whose specificity is determined by its interacting proteins. These interactors can be PPP1 substrates, regulators, or even both. Deregulation of this protein-protein interaction network alters cell dynamics and underlies the development of several cancer hallmarks. Therefore, the identification of PPP1 interactome in specific cellular context is of crucial importance. The knowledge on PPP1 complexes in prostate cancer remains scarce, with only 4 holoenzymes characterized in human prostate cancer models. However, an increasing number of PPP1 interactors have been identified as expressed in human prostate tissue, including the tumor suppressors TP53 and RB1. Efforts should be made in order to identify the role of such proteins in prostate carcinogenesis, since only 26 have yet well-recognized roles. Here, we revise literature and human protein databases to provide an in-depth knowledge on the biological significance of PPP1 complexes in human prostate carcinogenesis and their potential use as therapeutic targets for the development of new therapies for prostate cancer.
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31
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Balliu M, Guandalini L, Romanelli MN, D'Amico M, Paoletti F. HDAC-inhibitor (S)-8 disrupts HDAC6-PP1 complex prompting A375 melanoma cell growth arrest and apoptosis. J Cell Mol Med 2014; 19:143-54. [PMID: 25376115 PMCID: PMC4288358 DOI: 10.1111/jcmm.12345] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2014] [Accepted: 05/14/2014] [Indexed: 01/12/2023] Open
Abstract
Histone deacetylase inhibitors (HDACi) are agents capable of inducing growth arrest and apoptosis in different tumour cell types. Previously, we reported a series of novel HDACi obtained by hybridizing SAHA or oxamflatin with 1,4-benzodiazepines. Some of these hybrids proved effective against haematological and solid cancer cells and, above all, compound (S)-8 has emerged for its activities in various biological systems. Here, we describe the effectiveness of (S)-8 against highly metastatic human A375 melanoma cells by using normal PIG1 melanocytes as control. (S)-8 prompted: acetylation of histones H3/H4 and α-tubulin; G0/G1 and G2/M cell cycle arrest by rising p21 and hypophos-phorylated RB levels; apoptosis involving the cleavage of PARP and caspase 9, BAD protein augmentation and cytochrome c release; decrease in cell motility, invasiveness and pro-angiogenic potential as shown by results of wound-healing assay, down-regulation of MMP-2 and VEGF-A/VEGF-R2, besides TIMP-1/TIMP-2 up-regulation; and also intracellular accumulation of melanin and neutral lipids. The pan-caspase inhibitor Z-VAD-fmk, but not the antioxidant N-acetyl-cysteine, contrasted these events. Mechanistically, (S)-8 allows the disruption of cytoplasmic HDAC6-protein phosphatase 1 (PP1) complex in A375 cells thus releasing the active PP1 that dephosphorylates AKT and blocks its downstream pro-survival signalling. This view is consistent with results obtained by: inhibiting PP1 with Calyculin A; using PPP1R2-transfected cells with impaired PP1 activity; monitoring drug-induced HDAC6-PP1 complex re-shuffling; and, abrogating HDAC6 expression with specific siRNA. Altogether, (S)-8 proved very effective against melanoma A375 cells, but not normal melanocytes, and safe to normal mice thus offering attractive clinical prospects for treating this aggressive malignancy.
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Affiliation(s)
- Manjola Balliu
- Department of Experimental and Clinical Medicine, University of Florence, Firenze, Italy
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32
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Korrodi-Gregório L, Esteves SLC, Fardilha M. Protein phosphatase 1 catalytic isoforms: specificity toward interacting proteins. Transl Res 2014; 164:366-91. [PMID: 25090308 DOI: 10.1016/j.trsl.2014.07.001] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/23/2014] [Revised: 06/26/2014] [Accepted: 07/01/2014] [Indexed: 01/21/2023]
Abstract
The coordinated and reciprocal action of serine-threonine protein kinases and protein phosphatases produces transitory phosphorylation, a fundamental regulatory mechanism for many biological processes. Phosphoprotein phosphatase 1 (PPP1), a major serine-threonine phosphatase, in particular, is ubiquitously distributed and regulates a broad range of cellular functions, including glycogen metabolism, cell cycle progression, and muscle relaxation. PPP1 has evolved effective catalytic machinery but in vitro lacks substrate specificity. In vivo, its specificity is achieved not only by the existence of different PPP1 catalytic isoforms, but also by binding of the catalytic moiety to a large number of regulatory or targeting subunits. Here, we will address exhaustively the existence of diverse PPP1 catalytic isoforms and the relevance of their specific partners and consequent functions.
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Affiliation(s)
- Luís Korrodi-Gregório
- Laboratório de Transdução de Sinais, Departamento de Biologia, Secção Autónoma de Ciências de Saúde, Centro de Biologia Celular, Universidade de Aveiro, Aveiro, Portugal
| | - Sara L C Esteves
- Laboratório de Transdução de Sinais, Departamento de Biologia, Secção Autónoma de Ciências de Saúde, Centro de Biologia Celular, Universidade de Aveiro, Aveiro, Portugal
| | - Margarida Fardilha
- Laboratório de Transdução de Sinais, Departamento de Biologia, Secção Autónoma de Ciências de Saúde, Centro de Biologia Celular, Universidade de Aveiro, Aveiro, Portugal.
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33
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Abramova MV, Svetlikova SB, Kukushkin AN, Aksenov ND, Pospelova TV, Pospelov VA. HDAC inhibitor sodium butyrate sensitizes E1A+Ras-transformed cells to DNA damaging agents by facilitating formation and persistence of γH2AX foci. Cancer Biol Ther 2014; 12:1069-77. [DOI: 10.4161/cbt.12.12.18365] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
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34
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Cheng F, Lienlaf M, Wang HW, Perez-Villarroel P, Lee C, Woan K, Rock-Klotz J, Sahakian E, Woods D, Pinilla-Ibarz J, Kalin J, Tao J, Hancock W, Kozikowski A, Seto E, Villagra A, Sotomayor EM. A novel role for histone deacetylase 6 in the regulation of the tolerogenic STAT3/IL-10 pathway in APCs. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2014; 193:2850-62. [PMID: 25108026 PMCID: PMC4157123 DOI: 10.4049/jimmunol.1302778] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
APCs are critical in T cell activation and in the induction of T cell tolerance. Epigenetic modifications of specific genes in the APC play a key role in this process, and among them histone deacetylases (HDACs) have emerged as key participants. HDAC6, one of the members of this family of enzymes, has been shown to be involved in regulation of inflammatory and immune responses. In this study, to our knowledge we show for the first time that genetic or pharmacologic disruption of HDAC6 in macrophages and dendritic cells results in diminished production of the immunosuppressive cytokine IL-10 and induction of inflammatory APCs that effectively activate Ag-specific naive T cells and restore the responsiveness of anergic CD4(+) T cells. Mechanistically, we have found that HDAC6 forms a previously unknown molecular complex with STAT3, association that was detected in both the cytoplasmic and nuclear compartments of the APC. By using HDAC6 recombinant mutants we identified the domain comprising amino acids 503-840 as being required for HDAC6 interaction with STAT3. Furthermore, by re-chromatin immunoprecipitation we confirmed that HDAC6 and STAT3 are both recruited to the same DNA sequence within the Il10 gene promoter. Of note, disruption of this complex by knocking down HDAC6 resulted in decreased STAT3 phosphorylation--but no changes in STAT3 acetylation--as well as diminished recruitment of STAT3 to the Il10 gene promoter region. The additional demonstration that a selective HDAC6 inhibitor disrupts this STAT3/IL-10 tolerogenic axis points to HDAC6 as a novel molecular target in APCs to overcome immune tolerance and tips the balance toward T cell immunity.
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Affiliation(s)
- Fengdong Cheng
- Department of Immunology and Malignant Hematology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612
| | - Maritza Lienlaf
- Department of Immunology and Malignant Hematology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612
| | - Hong-Wei Wang
- Department of Immunology and Malignant Hematology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612
| | - Patricio Perez-Villarroel
- Department of Immunology and Malignant Hematology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612
| | - Calvin Lee
- All Children's Research Institute, All Children's Hospital-Johns Hopkins Medicine, St. Petersburg, FL 33701; Division of Pediatric Oncology, Johns Hopkins University School of Medicine, Baltimore, MD 21287
| | - Karrune Woan
- Department of Immunology and Malignant Hematology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612
| | - Jennifer Rock-Klotz
- Department of Immunology and Malignant Hematology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612
| | - Eva Sahakian
- Department of Immunology and Malignant Hematology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612
| | - David Woods
- Department of Immunology and Malignant Hematology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612
| | - Javier Pinilla-Ibarz
- Department of Immunology and Malignant Hematology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612
| | - Jay Kalin
- Drug Discovery Program, Department of Medicinal Chemistry and Pharmacognosy, University of Illinois, Chicago, IL 60612
| | - Jianguo Tao
- Department of Immunology and Malignant Hematology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612
| | - Wayne Hancock
- Department of Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia, PA 19104; and
| | - Alan Kozikowski
- Drug Discovery Program, Department of Medicinal Chemistry and Pharmacognosy, University of Illinois, Chicago, IL 60612
| | - Edward Seto
- Department of Molecular Oncology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612
| | - Alejandro Villagra
- Department of Immunology and Malignant Hematology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612;
| | - Eduardo M Sotomayor
- Department of Immunology and Malignant Hematology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612;
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35
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Du M, Fu X, Zhou Y, Zhu S. Effects of Trichostatin A on Cumulus Expansion during Mouse Oocyte Maturation. ASIAN-AUSTRALASIAN JOURNAL OF ANIMAL SCIENCES 2014; 26:1545-52. [PMID: 25049740 PMCID: PMC4093811 DOI: 10.5713/ajas.2013.13128] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/28/2013] [Revised: 06/03/2013] [Accepted: 04/08/2013] [Indexed: 01/12/2023]
Abstract
This study was conducted to investigate the effects of Trichostatin A (TSA) on cumulus expansion during mouse oocyte maturation. TSA treatment inhibited cumulus expansion and significantly reduced the cumulus expansion index (CEI) (p<0.05). To determine the underlying mechanism, the expression levels of several key factors that play crucial roles in cumulus expansion including components of extracellular matrix (ECM) (Has2, Ptgs2, Ptx3, and Tnfaip6) and Growth differentiation factor 9 (GDF9) were measured in control and TSA treated samples by real-time PCR. The effect of TSA on ERK phosphorylation (p-ERK1/2) in cumulus cells and GDF9 protein level in fully grown oocytes (FGOs) were detected by Western blotting. The expression levels of the ECM genes were significantly decreased (p<0.05) by TSA treatment while GDF9 expression did not response to TSA (p>0.05). TSA treatment blocked the activation of ERK1/2 (p<0.05) and had no significant effect on GDF9 protein expression (p>0.05). Collectively, these results suggested that TSA treatment altered ECM gene expression and blocked ERK1/2 activation to inhibit cumulus expansion in the mouse.
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Affiliation(s)
- Ming Du
- Key Laboratory of Animal Genetics, Breeding and Reproduction,Ministry of Agriculture and National Engineering Laboratoryfor Animal Breeding, College of Animal Science and Technology, China Agricultural University, Beijing, China
| | - Xiangwei Fu
- Key Laboratory of Animal Genetics, Breeding and Reproduction,Ministry of Agriculture and National Engineering Laboratoryfor Animal Breeding, College of Animal Science and Technology, China Agricultural University, Beijing, China
| | - Yanhua Zhou
- Key Laboratory of Animal Genetics, Breeding and Reproduction,Ministry of Agriculture and National Engineering Laboratoryfor Animal Breeding, College of Animal Science and Technology, China Agricultural University, Beijing, China
| | - Shien Zhu
- Key Laboratory of Animal Genetics, Breeding and Reproduction,Ministry of Agriculture and National Engineering Laboratoryfor Animal Breeding, College of Animal Science and Technology, China Agricultural University, Beijing, China
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36
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The role of epigenetic regulation in learning and memory. Exp Neurol 2014; 268:30-6. [PMID: 24837316 DOI: 10.1016/j.expneurol.2014.05.006] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2014] [Revised: 04/26/2014] [Accepted: 05/02/2014] [Indexed: 12/19/2022]
Abstract
The formation of long-term memory involves a series of molecular and cellular changes, including gene transcription, protein synthesis and synaptic plasticity dynamics. Some of these changes arise during learning and are subsequently retained throughout life. 'Epigenetic' regulation, which involves DNA methylation and histone modifications, plays a critical role in retaining long-term changes in post-mitotic cells. Accumulating evidence suggests that the epigenetic machinery might regulate the formation and stabilization of long-term memory in two ways: a 'gating' role of the chromatin state to regulate activity-triggered gene expression; and a 'stabilizing' role of the chromatin state to maintain molecular and cellular changes induced by the memory-related event. The neuronal activation regulates the dynamics of the chromatin status under precise timing, with subsequent alterations in the gene expression profile. This review summarizes the existing literature, focusing on the involvement of epigenetic regulation in learning and memory. We propose that the identification of different epigenetic regulators and signaling pathways involved in memory-related epigenetic regulations will provide mechanistic insights into the formation of long-term memory.
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37
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Joo EE, Yamada KM. MYPT1 regulates contractility and microtubule acetylation to modulate integrin adhesions and matrix assembly. Nat Commun 2014; 5:3510. [PMID: 24667306 DOI: 10.1038/ncomms4510] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2013] [Accepted: 02/25/2014] [Indexed: 01/16/2023] Open
Abstract
Although much is known about how individual cytoskeletal systems contribute to physiological processes such as cell migration and branching morphogenesis, little is known about how these different systems actively coordinate their functions after polymerization. Here we show that both fibroblasts and developing glands reciprocally coordinate levels of cellular contractility and microtubule acetylation. We find that this balance is achieved by interaction of the myosin phosphatase target subunit of myosin phosphatase with either myosin light chain or HDAC6, a microtubule deacetylase. This balance of contractility and microtubule acetylation controls progression of adhesion maturation by regulating surface density of α5β1 integrin and fibronectin. Thus, we propose that a homeostatic balance between contractility and microtubule acetylation is mediated by myosin phosphatase via controlled activation and deactivation of myosin II and HDAC6. This regulates the surface density of α5β1 integrin to modulate fibronectin matrix assembly and governs rates of cell migration and branching morphogenesis.
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Affiliation(s)
- E Emily Joo
- Laboratory of Cell and Developmental Biology, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, Maryland 20892, USA
| | - Kenneth M Yamada
- Laboratory of Cell and Developmental Biology, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, Maryland 20892, USA
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The HDAC inhibitor LBH589 induces ERK-dependent prometaphase arrest in prostate cancer via HDAC6 inactivation and down-regulation. PLoS One 2013; 8:e73401. [PMID: 24023871 PMCID: PMC3762759 DOI: 10.1371/journal.pone.0073401] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2013] [Accepted: 07/19/2013] [Indexed: 01/03/2023] Open
Abstract
Histone deacetylase inhibitors (HDACIs) have potent anti-cancer activity in a variety of cancer models. Understanding the molecular mechanisms involved in the therapeutic responsiveness of HDACI is needed before its clinical application. This study aimed to determine if a potent HDACI, LBH589 (Panobinostat), had differential therapeutic responsiveness towards LNCaP and PC-3 prostate cancer (PCa) cells. The former showed prometaphase arrest with subsequent apoptosis upon LBH589 treatment, while the latter was less sensitive and had late G2 arrest. The LBH589 treatment down-regulated HDAC6 and sustained ERK activation, and contributed to prometaphase arrest. Mechanistically, LBH589 inhibited HDAC6 activity, caused its dissociation from protein phosphatase PP1α, and increased 14-3-3ζ acetylation. Acetylated 14-3-3ζ released its mask effect on serine 259 of c-Raf and serine 216 of Cdc25C subsequent to de-phosphorylation by PP1α, which contributed to ERK activation. Enhanced ERK activity by LBH589 further down-regulated HDAC6 protein levels and sustained ERK activation by free-forward regulation. The sustained Cdc25C and ERK activation resulted in early M-phase (prometaphase) arrest and subsequent apoptosis in the most sensitive LNCaP cells but not in PC-3 cells. This study provides pre-clinical evidence that HDAC6 may serve as a sensitive therapeutic target in the treatment of prostate cancer with HDACI LBH589 for clinical translation. This study also posits a novel mechanism of HDAC6 participation in regulating the c-Raf-PP1-ERK signaling pathway and contributing to M phase cell-cycle transition.
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39
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Valin A, Gill G. Enforcing the pause: transcription factor Sp3 limits productive elongation by RNA polymerase II. Cell Cycle 2013; 12:1828-34. [PMID: 23676218 DOI: 10.4161/cc.24992] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
The transition of paused RNA polymerase II into productive elongation is a highly dynamic process that serves to fine-tune gene expression in response to changing cellular environments. We have recently reported that the transcription factor Sp3 inhibits the transition of paused RNA Pol II to productive elongation at the promoter of the cyclin-dependent kinase inhibitor p21(CIP1) and other Sp3-repressed genes. Our studies support the view that Sp3 has three modes of action: activation, SUMO-Sp3-mediated heterochromatin silencing and SUMO-independent inhibition of elongation. At the p21(CIP1) promoter, binding of the positive elongation factor P-TEFb kinase was not affected by Sp3. In contrast, Sp3 promoted binding of the protein phosphatase PP1 to the p21(CIP1) promoter, suggesting that Sp3-dependent regulation of the local balance between kinase and phosphatase activities may contribute to gene expression. Our findings show that the transition of paused RNA Pol II to productive elongation is an important step regulated by both promoter-specific activators and repressors to finely modulate mRNA expression levels.
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Affiliation(s)
- Alvaro Valin
- Department of Anatomy and Cellular Biology, Tufts University School of Medicine, Boston, MA, USA
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40
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Nikonova AS, Astsaturov I, Serebriiskii IG, Dunbrack RL, Golemis EA. Aurora A kinase (AURKA) in normal and pathological cell division. Cell Mol Life Sci 2013; 70:661-87. [PMID: 22864622 PMCID: PMC3607959 DOI: 10.1007/s00018-012-1073-7] [Citation(s) in RCA: 316] [Impact Index Per Article: 28.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2012] [Revised: 06/05/2012] [Accepted: 06/21/2012] [Indexed: 12/20/2022]
Abstract
Temporally and spatially controlled activation of the Aurora A kinase (AURKA) regulates centrosome maturation, entry into mitosis, formation and function of the bipolar spindle, and cytokinesis. Genetic amplification and mRNA and protein overexpression of Aurora A are common in many types of solid tumor, and associated with aneuploidy, supernumerary centrosomes, defective mitotic spindles, and resistance to apoptosis. These properties have led Aurora A to be considered a high-value target for development of cancer therapeutics, with multiple agents currently in early-phase clinical trials. More recently, identification of additional, non-mitotic functions and means of activation of Aurora A during interphase neurite elongation and ciliary resorption have significantly expanded our understanding of its function, and may offer insights into the clinical performance of Aurora A inhibitors. Here we review the mitotic and non-mitotic functions of Aurora A, discuss Aurora A regulation in the context of protein structural information, and evaluate progress in understanding and inhibiting Aurora A in cancer.
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Affiliation(s)
- Anna S. Nikonova
- Program in Developmental Therapeutics, Fox Chase Cancer Center, W406, 333 Cottman Ave., Philadelphia, PA 19111 USA
| | - Igor Astsaturov
- Program in Developmental Therapeutics, Fox Chase Cancer Center, W406, 333 Cottman Ave., Philadelphia, PA 19111 USA
| | - Ilya G. Serebriiskii
- Program in Developmental Therapeutics, Fox Chase Cancer Center, W406, 333 Cottman Ave., Philadelphia, PA 19111 USA
| | - Roland L. Dunbrack
- Program in Developmental Therapeutics, Fox Chase Cancer Center, W406, 333 Cottman Ave., Philadelphia, PA 19111 USA
| | - Erica A. Golemis
- Program in Developmental Therapeutics, Fox Chase Cancer Center, W406, 333 Cottman Ave., Philadelphia, PA 19111 USA
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41
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Zovkic IB, Guzman-Karlsson MC, Sweatt JD. Epigenetic regulation of memory formation and maintenance. Learn Mem 2013; 20:61-74. [PMID: 23322554 DOI: 10.1101/lm.026575.112] [Citation(s) in RCA: 229] [Impact Index Per Article: 20.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Understanding the cellular and molecular mechanisms underlying the formation and maintenance of memories is a central goal of the neuroscience community. It is well regarded that an organism's ability to lastingly adapt its behavior in response to a transient environmental stimulus relies on the central nervous system's capability for structural and functional plasticity. This plasticity is dependent on a well-regulated program of neurotransmitter release, post-synaptic receptor activation, intracellular signaling cascades, gene transcription, and subsequent protein synthesis. In the last decade, epigenetic markers like DNA methylation and post-translational modifications of histone tails have emerged as important regulators of the memory process. Their ability to regulate gene transcription dynamically in response to neuronal activation supports the consolidation of long-term memory. Furthermore, the persistent and self-propagating nature of these mechanisms, particularly DNA methylation, suggests a molecular mechanism for memory maintenance. In this review, we will examine the evidence that supports a role of epigenetic mechanisms in learning and memory. In doing so, we hope to emphasize (1) the widespread involvement of these mechanisms across different behavioral paradigms and distinct brain regions, (2) the temporal and genetic specificity of these mechanisms in response to upstream signaling cascades, and (3) the functional outcome these mechanisms may have on structural and functional plasticity. Finally, we consider the future directions of neuroepigenetic research as it relates to neuronal storage of information.
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Affiliation(s)
- Iva B Zovkic
- Department of Neurobiology and Evelyn F McKnight Brain Institute, University of Alabama at Birmingham, Birmingham, Alabama 35294, USA
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42
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Abstract
Long-term memory formation requires transcription and protein synthesis. Over the past few decades, a great amount of knowledge has been gained regarding the molecular players that regulate the transcriptional program linked to memory consolidation. Epigenetic mechanisms have been shown to be essential for the regulation of neuronal gene expression, and histone acetylation has been one of the most studied and best characterized. In this review, we summarize the lines of evidence that have shown the relevance of histone acetylation in memory in both physiological and pathological conditions. Great advances have been made in identifying the writers and erasers of histone acetylation marks during learning. However, the identities of the upstream regulators and downstream targets that mediate the effect of changes in histone acetylation during memory consolidation remain restricted to a handful of molecules. We outline a general model by which corepressors and coactivators regulate histone acetylation during memory storage and discuss how the recent advances in high-throughput sequencing have the potential to radically change our understanding of how epigenetic control operates in the brain.
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Affiliation(s)
- Lucia Peixoto
- Department of Biology, School of Arts and Sciences, University of Pennsylvania, Philadelphia, PA, USA
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43
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Esteves SLC, Domingues SC, da Cruz e Silva OAB, Fardilha M, da Cruz e Silva EF. Protein phosphatase 1α interacting proteins in the human brain. OMICS-A JOURNAL OF INTEGRATIVE BIOLOGY 2012; 16:3-17. [PMID: 22321011 DOI: 10.1089/omi.2011.0041] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Protein Phosphatase 1 (PP1) is a major serine/threonine-phosphatase whose activity is dependent on its binding to regulatory subunits known as PP1 interacting proteins (PIPs), responsible for targeting PP1 to a specific cellular location, specifying its substrate or regulating its action. Today, more than 200 PIPs have been described involving PP1 in panoply of cellular mechanisms. Moreover, several PIPs have been identified that are tissue and event specific. In addition, the diversity of PP1/PIP complexes can further be achieved by the existence of several PP1 isoforms that can bind preferentially to a certain PIP. Thus, PP1/PIP complexes are highly specific for a particular function in the cell, and as such, they are excellent pharmacological targets. Hence, an in-depth survey was taken to identify specific PP1α PIPs in human brain by a high-throughput Yeast Two-Hybrid approach. Sixty-six proteins were recognized to bind PP1α, 39 being novel PIPs. A large protein interaction databases search was also performed to integrate with the results of the PP1α Human Brain Yeast Two-Hybrid and a total of 246 interactions were retrieved.
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Affiliation(s)
- Sara L C Esteves
- Signal Transduction Laboratory, Centre for Cell Biology, Biology Department, University of Aveiro, Portugal
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Liang J, Li T, Zhang YL, Guo ZL, Xu LH. Effect of microcystin-LR on protein phosphatase 2A and its function in human amniotic epithelial cells. J Zhejiang Univ Sci B 2012; 12:951-60. [PMID: 22135143 DOI: 10.1631/jzus.b1100121] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Due to their toxicity, the increased distribution of microcystins (MCs) has become an important worldwide problem. MCs have been recognized as inhibitors of protein phosphatase 2A (PP2A) through their binding to the PP2A catalytic subunit. However, the exact mechanism of MC toxicity has not been elucidated, especially concerning the cellular response and its autoregulation. To further dissect the role of PP2A in MC-induced toxicity, the present study was undertaken to determine the response of PP2A in human amniotic epithelial (FL) cells treated with microcystin-LR (MCLR), one of the MC congeners. The results show that a low-dose treatment of MCLR in FL cells for 6 h induced an increase in PP2A activity, and a high-dose treatment of MCLR for 24 h decreased the activity of PP2A, as expected. The increased mRNA and protein levels of the PP2A C subunit may explain the increased activity of PP2A. Furthermore, MCLR altered microtubule post-translational modifications through PP2A. These results further clarify the underlying mechanism how MCLR affects PP2A and may be helpful for elucidating the complex toxicity of MCLR.
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Affiliation(s)
- Jing Liang
- Department of Biochemistry and Genetics, School of Medicine, Zhejiang University, Hangzhou, China
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45
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Tsaytler P, Bertolotti A. Exploiting the selectivity of protein phosphatase 1 for pharmacological intervention. FEBS J 2012; 280:766-70. [PMID: 22340633 DOI: 10.1111/j.1742-4658.2012.08535.x] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Selective and reversible phosphorylation is one of the most common post-translational modifications of proteins. Although kinase inhibitors are popular in drug development programmes, selective pharmacological manipulation of phosphatase activity has been challenging to achieve. We review recent advances in the development of selective inhibitors of dephosphorylation events and discuss the potential applications of small-molecule phosphatase inhibitors.
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46
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Abstract
Inflammatory tolerance is a crucial mechanism that limits inflammatory responses in order to avoid prolonged inflammation that may damage the host. Evidence that chronic inflammation contributes to the neuropathology of prevalent neurodegenerative and psychiatric diseases suggests that inflammatory tolerance mechanisms are often inadequate to control detrimental inflammation in the central nervous system. Thus, identifying mechanisms that regulate neuroinflammatory tolerance may reveal opportunities for bolstering tolerance to reduce chronic inflammation in these diseases. Examination of tolerance after repeated lipopolysaccharide (LPS) treatment of mouse primary astrocytes demonstrated that histone deacetylase (HDAC) activity promoted tolerance, opposite to the action of glycogen synthase kinase-3 (GSK3), which counteracts tolerance. HDAC6 in particular was found to be critical for tolerance induction, as its deacetylation of acetyl-tubulin was increased during LPS tolerance, this was enhanced by inhibition of GSK3, and the HDAC6 inhibitor tubacin completely blocked tolerance and the promotion of tolerance by inhibition of GSK3. These results reveal opposing interactions between HDAC6 and GSK3 in regulating tolerance, and indicate that shifting the balance between these two opposing forces on inflammatory tolerance can obliterate or enhance tolerance to LPS in astrocytes.
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47
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Saito S, Lasky JA, Guo W, Nguyen H, Mai A, Danchuk S, Sullivan DE, Shan B. Pharmacological inhibition of HDAC6 attenuates endothelial barrier dysfunction induced by thrombin. Biochem Biophys Res Commun 2011; 408:630-4. [PMID: 21531207 DOI: 10.1016/j.bbrc.2011.04.075] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2011] [Accepted: 04/16/2011] [Indexed: 10/18/2022]
Abstract
BACKGROUND Endothelial barrier dysfunction (EBD) involves microtubule disassembly and enhanced cell contractility. Histone deacetylase 6 (HDAC6) deacetylates α-tubulin, and thereby destabilizes microtubules. This study investigates a role for HDAC6 in EBD. METHODS EBD was induced with thrombin±HDAC6 inhibitors (tubacin and MC1575), and assessed by transendothelial electrical resistance (TEER). Markers for microtubule disassembly (α-tubulin and acetylated α-tubulin) and contraction (phosphorylated myosin light chain 2, P-MLC2) were measured using immunoblots and immunofluorescence. RESULTS AND CONCLUSION Thrombin induced a ∼50% decrease in TEER that was abrogated by the HDAC6 inhibitors. Moreover, inhibition of HDAC6 diminished edema in the lung injured by lipopolysaccharide. Lastly, inhibition of HDAC6 attenuated thrombin-induced microtubule disassembly and P-MLC2. Our results suggest that HDAC6 can be targeted to limit EBD.
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Affiliation(s)
- Shigeki Saito
- Department of Medicine, Tulane Medical School, New Orleans, LA, USA
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48
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Watabe M, Nakaki T. Protein kinase CK2 regulates the formation and clearance of aggresomes in response to stress. J Cell Sci 2011; 124:1519-32. [PMID: 21486957 DOI: 10.1242/jcs.081778] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Misfolded protein aggregates elicit a stress response, and their clearance is crucial for cell survival. These aggregates are transported by cytoplasmic deacetylase HDAC6 and dynein motors to the aggresome via the microtubule network, and are removed by autophagic degradation. HDAC6 activity is necessary for both the transport and clearance of protein aggregates. However, the cellular factors that regulate HDAC6 activity remain unknown. Here we show that protein kinase CK2 is a crucial modulator of HDAC6 activity because CK2 directly phosphorylates HDAC6 and increases cytoplasmic deacetylase activity. Indeed, cells that expressed HDAC6 mutated at Ser458, a CK2-mediated phosphorylation site, failed to both form and clear aggresomes, and increased cytotoxicity. Interestingly, Ser458 is conserved only in higher primates, such as human and chimpanzee, but not in the rhesus macaque. These findings identify CK2 as a crucial protein involved in the formation and clearance of aggresomes, and hence in cell viability in response to misfolded protein stress.
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Affiliation(s)
- Masahiko Watabe
- Department of Pharmacology, Teikyo University School of Medicine, Tokyo 173-8605, Japan
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49
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Zhu QY, Wang Z, Ji C, Cheng L, Yang YL, Ren J, Jin YH, Wang QJ, Gu XJ, Bi ZG, Hu G, Yang Y. C6-ceramide synergistically potentiates the anti-tumor effects of histone deacetylase inhibitors via AKT dephosphorylation and α-tubulin hyperacetylation both in vitro and in vivo. Cell Death Dis 2011; 2:e117. [PMID: 21368888 PMCID: PMC3077291 DOI: 10.1038/cddis.2010.96] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Histone deacetylase inhibitors (HDACIs) have shown promising anti-tumor effects for a variety of malignancies, however, many tumors are reportedly resistant to them. In this study, we made a novel discovery that co-administration of HDACIs (Trichostatin A (TSA) and others) and exogenous cell-permeable short-chain ceramide (C6) results in striking increase in cancer cell death and apoptosis in multiple cancer cells. These events are associated with perturbations in diverse cell signaling pathways, including inactivation of Akt/mTOR and increase in α-tubulin acetylation (both in vivo and in vitro). TSA interacts in a highly synergistic manner with C6-ceramide to disrupt HDAC6/protein phosphatase 1 (PP1)/tubulin complex, to induce α-tubulin hyperacetylation, and to release and activate PP1, which then leads to AKT dephosphorylation and eventually causes cancer cell death. Interestingly, TSA itself results in short-term ceramide accumulation, which as a result of metabolic (glycosylation) removal, does not result in evident increase of cancer cell death. However, adding C6-ceramide led to a very pronounced increase in ceramide level and marked increase in cell death. Importantly, the effective synergistic anti-tumor activity of TSA plus C6-ceramide is also seen in in vivo mice xenograft pancreatic and ovarian cancer models, indicating that this regimen (HDACI plus C6-ceramide) may represent a more effective form of therapy against pancreatic and ovarian carcinoma.
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Affiliation(s)
- Q-y Zhu
- Department of Physiology, China Pharmaceutical University, Nanjing, PR China
- Department of Urology, Jiangsu Province Hospital of TCM, Nanjing, PR China
| | - Z Wang
- Department of Physiology, China Pharmaceutical University, Nanjing, PR China
| | - C Ji
- Department of Dermatology, the First Affiliated Hospital of Nanjing Medical University, Nanjing, PR China
| | - L Cheng
- Department of Otorhinolaryngology, the First Affiliated Hospital of Nanjing Medical University, Nanjing, PR China
| | - Y-l Yang
- Department of Otorhinolaryngology, the First Affiliated Hospital of Nanjing Medical University, Nanjing, PR China
| | - J Ren
- Department of Physiology, China Pharmaceutical University, Nanjing, PR China
| | - Y-h Jin
- Department of Physiology, China Pharmaceutical University, Nanjing, PR China
| | - Q-j Wang
- Department of Physiology, China Pharmaceutical University, Nanjing, PR China
| | - X-j Gu
- Department of Urology, Jiangsu Province Hospital of TCM, Nanjing, PR China
| | - Z-g Bi
- Department of Dermatology, the Affiliated BenQ Hospital of Nanjing Medical University, Nanjing, PR China
- Department of Dermatology, the Affiliated BenQ Hospital of Nanjing Medical University, Nanjing 210019, PR China. Tel: +86 25 52238800; E-mail:
| | - G Hu
- Jiangsu Province Key Lab of Neurodegeneration, Department of Pharmacology, Nanjing Medical University, Nanjing, PR China
- Jiangsu Province Key Lab of Neurodegeneration, Department of Pharmacology, Nanjing Medical University, Nanjing, PR China. Tel: +86 25 86863108; Fax: +86 25 86863108; E-mail:
| | - Y Yang
- Department of Physiology, China Pharmaceutical University, Nanjing, PR China
- Department of Physiology, China Pharmaceutical University, Nanjing 210009, PR China. Tel: +86 25 83271132; Fax: +86 025 83271132; E-mail:
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50
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Sadoul K, Wang J, Diagouraga B, Khochbin S. The tale of protein lysine acetylation in the cytoplasm. J Biomed Biotechnol 2011; 2011:970382. [PMID: 21151618 PMCID: PMC2997609 DOI: 10.1155/2011/970382] [Citation(s) in RCA: 118] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2010] [Accepted: 09/29/2010] [Indexed: 12/21/2022] Open
Abstract
Reversible posttranslational modification of internal lysines in many cellular or viral proteins is now emerging as part of critical signalling processes controlling a variety of cellular functions beyond chromatin and transcription. This paper aims at demonstrating the role of lysine acetylation in the cytoplasm driving and coordinating key events such as cytoskeleton dynamics, intracellular trafficking, vesicle fusion, metabolism, and stress response.
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Affiliation(s)
- Karin Sadoul
- 1INSERM, U823, Institut Albert Bonniot, Université Joseph Fourier Grenoble 1, 38700 Grenoble, France
- *Karin Sadoul:
| | - Jin Wang
- 1INSERM, U823, Institut Albert Bonniot, Université Joseph Fourier Grenoble 1, 38700 Grenoble, France
- 2State Key Laboratory of Medical Genomics, Department of Hematology, Ruijin Hospital, Shanghai Institute of Hematology, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - Boubou Diagouraga
- 1INSERM, U823, Institut Albert Bonniot, Université Joseph Fourier Grenoble 1, 38700 Grenoble, France
| | - Saadi Khochbin
- 1INSERM, U823, Institut Albert Bonniot, Université Joseph Fourier Grenoble 1, 38700 Grenoble, France
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